331121647 has 2 divisors, whose sum is σ = 331121648. Its totient is φ = 331121646.

The previous prime is 331121587. The next prime is 331121653. The reversal of 331121647 is 746121133.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 331121647 - 2⁷ = 331121519 is a prime.

It is a super-2 number, since 2×331121647² = 219283090223985218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331121677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165560823 + 165560824.

It is an arithmetic number, because the mean of its divisors is an integer number (165560824).

Almost surely, 2^331121647 is an apocalyptic number.

331121647 is a deficient number, since it is larger than the sum of its proper divisors (1).

331121647 is an equidigital number, since it uses as much as digits as its factorization.

331121647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

The square root of 331121647 is about 18196.7482534655. The cubic root of 331121647 is about 691.8243725227.

The spelling of 331121647 in words is "three hundred thirty-one million, one hundred twenty-one thousand, six hundred forty-seven".