51197643 has 32 divisors (see below), whose sum is σ = 88811520. Its totient is φ = 28537920.

The previous prime is 51197639. The next prime is 51197683. The reversal of 51197643 is 34679115.

51197643 is a `hidden beast` number, since 5 + 1 + 1 + 9 + 7 + 643 = 666.

It is not a de Polignac number, because 51197643 - 2² = 51197639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51197598 and 51197607.

It is not an unprimeable number, because it can be changed into a prime (51197683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4446 + ... + 11052.

It is an arithmetic number, because the mean of its divisors is an integer number (2775360).

Almost surely, 2^51197643 is an apocalyptic number.

51197643 is a deficient number, since it is larger than the sum of its proper divisors (37613877).

51197643 is a wasteful number, since it uses less digits than its factorization.

51197643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6664 (or 6658 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 51197643 is about 7155.2528257218. The cubic root of 51197643 is about 371.3214085678.

The spelling of 51197643 in words is "fifty-one million, one hundred ninety-seven thousand, six hundred forty-three".