51491056 has 10 divisors (see below), whose sum is σ = 99763952. Its totient is φ = 25745520.

The previous prime is 51491047. The next prime is 51491057. The reversal of 51491056 is 65019415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51491057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1609080 + ... + 1609111.

Almost surely, 2^51491056 is an apocalyptic number.

It is an amenable number.

51491056 is a deficient number, since it is larger than the sum of its proper divisors (48272896).

51491056 is a wasteful number, since it uses less digits than its factorization.

51491056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3218199 (or 3218193 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 51491056 is about 7175.7268621374. The cubic root of 51491056 is about 372.0294037728.

The spelling of 51491056 in words is "fifty-one million, four hundred ninety-one thousand, fifty-six".