131551531 has 2 divisors, whose sum is σ = 131551532. Its totient is φ = 131551530.

The previous prime is 131551529. The next prime is 131551561. The reversal of 131551531 is 135155131.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (135155131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131551531 - 2¹ = 131551529 is a prime.

It is a super-2 number, since 2×131551531² = 34611610616887922, which contains 22 as substring.

Together with 131551529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 131551496 and 131551505.

It is not a weakly prime, because it can be changed into another prime (131551561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65775765 + 65775766.

It is an arithmetic number, because the mean of its divisors is an integer number (65775766).

Almost surely, 2^131551531 is an apocalyptic number.

131551531 is a deficient number, since it is larger than the sum of its proper divisors (1).

131551531 is an equidigital number, since it uses as much as digits as its factorization.

131551531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1125, while the sum is 25.

The square root of 131551531 is about 11469.5915794766. The cubic root of 131551531 is about 508.5870553757.

The spelling of 131551531 in words is "one hundred thirty-one million, five hundred fifty-one thousand, five hundred thirty-one".