131937409 has 2 divisors, whose sum is σ = 131937410. Its totient is φ = 131937408.

The previous prime is 131937389. The next prime is 131937419. The reversal of 131937409 is 904739131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131606784 + 330625 = 11472^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 131937409 - 2⁹ = 131936897 is a prime.

It is not a weakly prime, because it can be changed into another prime (131937419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65968704 + 65968705.

It is an arithmetic number, because the mean of its divisors is an integer number (65968705).

Almost surely, 2^131937409 is an apocalyptic number.

It is an amenable number.

131937409 is a deficient number, since it is larger than the sum of its proper divisors (1).

131937409 is an equidigital number, since it uses as much as digits as its factorization.

131937409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 131937409 is about 11486.4010464549. The cubic root of 131937409 is about 509.0838467046.

It can be divided in two parts, 13193 and 7409, that added together give a palindrome (20602).

The spelling of 131937409 in words is "one hundred thirty-one million, nine hundred thirty-seven thousand, four hundred nine".