51491144 has 16 divisors (see below), whose sum is σ = 96934320. Its totient is φ = 25642000.

The previous prime is 51491119. The next prime is 51491149. The reversal of 51491144 is 44119415.

It is not an unprimeable number, because it can be changed into a prime (51491149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10814 + ... + 14829.

It is an arithmetic number, because the mean of its divisors is an integer number (6058395).

Almost surely, 2^51491144 is an apocalyptic number.

It is an amenable number.

51491144 is a deficient number, since it is larger than the sum of its proper divisors (45443176).

51491144 is a wasteful number, since it uses less digits than its factorization.

51491144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25900 (or 25896 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 51491144 is about 7175.7329939178. The cubic root of 51491144 is about 372.0296157098.

The spelling of 51491144 in words is "fifty-one million, four hundred ninety-one thousand, one hundred forty-four".