247331431 has 2 divisors, whose sum is σ = 247331432. Its totient is φ = 247331430.

The previous prime is 247331387. The next prime is 247331471. The reversal of 247331431 is 134133742.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247331431 is a prime.

It is a super-2 number, since 2×247331431² = 122345673521015522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 247331431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247331471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123665715 + 123665716.

It is an arithmetic number, because the mean of its divisors is an integer number (123665716).

Almost surely, 2^247331431 is an apocalyptic number.

247331431 is a deficient number, since it is larger than the sum of its proper divisors (1).

247331431 is an equidigital number, since it uses as much as digits as its factorization.

247331431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 28.

The square root of 247331431 is about 15726.7743355082. The cubic root of 247331431 is about 627.7110444973.

The spelling of 247331431 in words is "two hundred forty-seven million, three hundred thirty-one thousand, four hundred thirty-one".