51523140 has 48 divisors (see below), whose sum is σ = 149244480. Its totient is φ = 13265280.

The previous prime is 51523133. The next prime is 51523187. The reversal of 51523140 is 4132515.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13066 + ... + 16545.

It is an arithmetic number, because the mean of its divisors is an integer number (3109260).

Almost surely, 2^51523140 is an apocalyptic number.

It is an amenable number.

51523140 is an abundant number, since it is smaller than the sum of its proper divisors (97721340).

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

51523140 is a wasteful number, since it uses less digits than its factorization.

51523140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29652 (or 29650 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51523140 is about 7177.9621063363. The cubic root of 51523140 is about 372.1066580511.

Adding to 51523140 its reverse (4132515), we get a palindrome (55655655).

The spelling of 51523140 in words is "fifty-one million, five hundred twenty-three thousand, one hundred forty".