51656361 has 8 divisors (see below), whose sum is σ = 69417984. Its totient is φ = 34166160.

The previous prime is 51656309. The next prime is 51656369. The reversal of 51656361 is 16365615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51656361 - 2⁷ = 51656233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51656369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67410 + ... + 68171.

It is an arithmetic number, because the mean of its divisors is an integer number (8677248).

Almost surely, 2^51656361 is an apocalyptic number.

It is an amenable number.

51656361 is a deficient number, since it is larger than the sum of its proper divisors (17761623).

51656361 is a wasteful number, since it uses less digits than its factorization.

51656361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135711.

The product of its digits is 16200, while the sum is 33.

The square root of 51656361 is about 7187.2359777595. The cubic root of 51656361 is about 372.4270950215.

The spelling of 51656361 in words is "fifty-one million, six hundred fifty-six thousand, three hundred sixty-one".