247661431 has 2 divisors, whose sum is σ = 247661432. Its totient is φ = 247661430.

The previous prime is 247661399. The next prime is 247661441. The reversal of 247661431 is 134166742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247661431 - 2⁵ = 247661399 is a prime.

It is a super-2 number, since 2×247661431² = 122672368809935522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247661441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123830715 + 123830716.

It is an arithmetic number, because the mean of its divisors is an integer number (123830716).

Almost surely, 2^247661431 is an apocalyptic number.

247661431 is a deficient number, since it is larger than the sum of its proper divisors (1).

247661431 is an equidigital number, since it uses as much as digits as its factorization.

247661431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 247661431 is about 15737.2625001936. The cubic root of 247661431 is about 627.9900932552.

The spelling of 247661431 in words is "two hundred forty-seven million, six hundred sixty-one thousand, four hundred thirty-one".