331252409 has 2 divisors, whose sum is σ = 331252410. Its totient is φ = 331252408.

The previous prime is 331252367. The next prime is 331252421. The reversal of 331252409 is 904252133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 293368384 + 37884025 = 17128^2 + 6155^2 .

It is a cyclic number.

It is not a de Polignac number, because 331252409 - 2⁸ = 331252153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (331252459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165626204 + 165626205.

It is an arithmetic number, because the mean of its divisors is an integer number (165626205).

Almost surely, 2^331252409 is an apocalyptic number.

It is an amenable number.

331252409 is a deficient number, since it is larger than the sum of its proper divisors (1).

331252409 is an equidigital number, since it uses as much as digits as its factorization.

331252409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 331252409 is about 18200.3409034007. The cubic root of 331252409 is about 691.9154291215.

The spelling of 331252409 in words is "three hundred thirty-one million, two hundred fifty-two thousand, four hundred nine".