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815121001 is a prime number
BaseRepresentation
bin110000100101011…
…100001001101001
32002210210102210201
4300211130021221
53132132333001
6212514512201
726125262032
oct6045341151
92083712721
10815121001
11389129522
121a8b95661
13ccb48626
147a383a89
154b862501
hex3095c269

815121001 has 2 divisors, whose sum is σ = 815121002. Its totient is φ = 815121000.

The previous prime is 815120987. The next prime is 815121017. The reversal of 815121001 is 100121518.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 767234601 + 47886400 = 27699^2 + 6920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-815121001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 815121001.

It is not a weakly prime, because it can be changed into another prime (815121031) 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, 407560500 + 407560501.

It is an arithmetic number, because the mean of its divisors is an integer number (407560501).

Almost surely, 2815121001 is an apocalyptic number.

It is an amenable number.

815121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

815121001 is an equidigital number, since it uses as much as digits as its factorization.

815121001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 815121001 is about 28550.3240086693. The cubic root of 815121001 is about 934.1300881673.

Adding to 815121001 its reverse (100121518), we get a palindrome (915242519).

The spelling of 815121001 in words is "eight hundred fifteen million, one hundred twenty-one thousand, one".