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10115531 is a prime number
BaseRepresentation
bin100110100101…
…100111001011
3201000220220022
4212211213023
510042144111
61000451055
7151660226
oct46454713
921026808
1010115531
115789a48
123479a8b
13213232a
1414b45bd
15d4c2db
hex9a59cb

10115531 has 2 divisors, whose sum is σ = 10115532. Its totient is φ = 10115530.

The previous prime is 10115513. The next prime is 10115533. The reversal of 10115531 is 13551101.

Together with previous prime (10115513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13551101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10115531 - 214 = 10099147 is a prime.

It is a super-2 number, since 2×101155312 = 204647934823922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 10115533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10115533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5057765 + 5057766.

It is an arithmetic number, because the mean of its divisors is an integer number (5057766).

Almost surely, 210115531 is an apocalyptic number.

10115531 is a deficient number, since it is larger than the sum of its proper divisors (1).

10115531 is an equidigital number, since it uses as much as digits as its factorization.

10115531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75, while the sum is 17.

The square root of 10115531 is about 3180.4922574973. The cubic root of 10115531 is about 216.2699742094.

Adding to 10115531 its reverse (13551101), we get a palindrome (23666632).

The spelling of 10115531 in words is "ten million, one hundred fifteen thousand, five hundred thirty-one".