51397152 has 24 divisors (see below), whose sum is σ = 134917776. Its totient is φ = 17132352.

The previous prime is 51397141. The next prime is 51397207. The reversal of 51397152 is 25179315.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×51397152² = 5283334467422208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267598 + ... + 267789.

It is an arithmetic number, because the mean of its divisors is an integer number (5621574).

Almost surely, 2^51397152 is an apocalyptic number.

It is an amenable number.

51397152 is an abundant number, since it is smaller than the sum of its proper divisors (83520624).

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

51397152 is a wasteful number, since it uses less digits than its factorization.

51397152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535400 (or 535392 counting only the distinct ones).

The product of its digits is 9450, while the sum is 33.

The square root of 51397152 is about 7169.1807063290. The cubic root of 51397152 is about 371.8031100541.

The spelling of 51397152 in words is "fifty-one million, three hundred ninety-seven thousand, one hundred fifty-two".