51490971 has 24 divisors (see below), whose sum is σ = 88152064. Its totient is φ = 29422440.

The previous prime is 51490937. The next prime is 51490987. The reversal of 51490971 is 17909415.

It is not a de Polignac number, because 51490971 - 2⁷ = 51490843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51490471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13435 + ... + 16836.

Almost surely, 2^51490971 is an apocalyptic number.

51490971 is a deficient number, since it is larger than the sum of its proper divisors (36661093).

51490971 is an equidigital number, since it uses as much as digits as its factorization.

51490971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30293 (or 30281 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 51490971 is about 7175.7209393900. The cubic root of 51490971 is about 372.0291990608.

The spelling of 51490971 in words is "fifty-one million, four hundred ninety thousand, nine hundred seventy-one".