51191040 has 72 divisors (see below), whose sum is σ = 163503648. Its totient is φ = 13649920.

The previous prime is 51191039. The next prime is 51191053. The reversal of 51191040 is 4019115.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 51190998 and 51191016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2826 + ... + 10505.

It is an arithmetic number, because the mean of its divisors is an integer number (2270884).

Almost surely, 2^51191040 is an apocalyptic number.

It is an amenable number.

51191040 is an abundant number, since it is smaller than the sum of its proper divisors (112312608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51191040 is a wasteful number, since it uses less digits than its factorization.

51191040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13355 (or 13341 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 51191040 is about 7154.7914015714. The cubic root of 51191040 is about 371.3054446775.

The spelling of 51191040 in words is "fifty-one million, one hundred ninety-one thousand, forty".