51356565 has 48 divisors (see below), whose sum is σ = 98907840. Its totient is φ = 25272000.

The previous prime is 51356561. The next prime is 51356603. The reversal of 51356565 is 56565315.

It is not a de Polignac number, because 51356565 - 2² = 51356561 is a prime.

51356565 is a modest number, since divided by 6565 gives 5135 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51356561) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21690 + ... + 23940.

It is an arithmetic number, because the mean of its divisors is an integer number (2060580).

Almost surely, 2^51356565 is an apocalyptic number.

It is an amenable number.

51356565 is a deficient number, since it is larger than the sum of its proper divisors (47551275).

51356565 is a wasteful number, since it uses less digits than its factorization.

51356565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291 (or 2272 counting only the distinct ones).

The product of its digits is 67500, while the sum is 36.

The square root of 51356565 is about 7166.3494891053. The cubic root of 51356565 is about 371.7052165188.

The spelling of 51356565 in words is "fifty-one million, three hundred fifty-six thousand, five hundred sixty-five".