247990931 has 2 divisors, whose sum is σ = 247990932. Its totient is φ = 247990930.

The previous prime is 247990927. The next prime is 247990949. The reversal of 247990931 is 139099742.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247990931 - 2² = 247990927 is a prime.

It is a super-2 number, since 2×247990931² = 122999003716493522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247990231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123995465 + 123995466.

It is an arithmetic number, because the mean of its divisors is an integer number (123995466).

Almost surely, 2^247990931 is an apocalyptic number.

247990931 is a deficient number, since it is larger than the sum of its proper divisors (1).

247990931 is an equidigital number, since it uses as much as digits as its factorization.

247990931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 247990931 is about 15747.7278043532. The cubic root of 247990931 is about 628.2684720029.

The spelling of 247990931 in words is "two hundred forty-seven million, nine hundred ninety thousand, nine hundred thirty-one".