131252981 has 2 divisors, whose sum is σ = 131252982. Its totient is φ = 131252980.

The previous prime is 131252959. The next prime is 131253011. The reversal of 131252981 is 189252131.

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., 128822500 + 2430481 = 11350^2 + 1559^2 .

It is a cyclic number.

It is not a de Polignac number, because 131252981 - 2¹⁰ = 131251957 is a prime.

It is a super-2 number, since 2×131252981² = 34454690042772722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131252911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65626490 + 65626491.

It is an arithmetic number, because the mean of its divisors is an integer number (65626491).

Almost surely, 2^131252981 is an apocalyptic number.

It is an amenable number.

131252981 is a deficient number, since it is larger than the sum of its proper divisors (1).

131252981 is an equidigital number, since it uses as much as digits as its factorization.

131252981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 32.

The square root of 131252981 is about 11456.5693381570. The cubic root of 131252981 is about 508.2020258418.

The spelling of 131252981 in words is "one hundred thirty-one million, two hundred fifty-two thousand, nine hundred eighty-one".