131956009 has 2 divisors, whose sum is σ = 131956010. Its totient is φ = 131956008.

The previous prime is 131955997. The next prime is 131956043. The reversal of 131956009 is 900659131.

It is an a-pointer prime, because the next prime (131956043) can be obtained adding 131956009 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121066009 + 10890000 = 11003^2 + 3300^2 .

It is a cyclic number.

It is not a de Polignac number, because 131956009 - 2⁵ = 131955977 is a prime.

It is a super-2 number, since 2×131956009² = 34824776622416162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131926009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65978004 + 65978005.

It is an arithmetic number, because the mean of its divisors is an integer number (65978005).

Almost surely, 2^131956009 is an apocalyptic number.

It is an amenable number.

131956009 is a deficient number, since it is larger than the sum of its proper divisors (1).

131956009 is an equidigital number, since it uses as much as digits as its factorization.

131956009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 131956009 is about 11487.2106710028. The cubic root of 131956009 is about 509.1077684381.

The spelling of 131956009 in words is "one hundred thirty-one million, nine hundred fifty-six thousand, nine".