890749931 has 2 divisors, whose sum is σ = 890749932. Its totient is φ = 890749930.

The previous prime is 890749907. The next prime is 890749949. The reversal of 890749931 is 139947098.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-890749931 is a prime.

It is a super-2 number, since 2×890749931² = 1586870879153009522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 890749931.

It is not a weakly prime, because it can be changed into another prime (890749961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445374965 + 445374966.

It is an arithmetic number, because the mean of its divisors is an integer number (445374966).

Almost surely, 2^890749931 is an apocalyptic number.

890749931 is a deficient number, since it is larger than the sum of its proper divisors (1).

890749931 is an equidigital number, since it uses as much as digits as its factorization.

890749931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 890749931 is about 29845.4340058911. The cubic root of 890749931 is about 962.1702675786.

The spelling of 890749931 in words is "eight hundred ninety million, seven hundred forty-nine thousand, nine hundred thirty-one".