51565601 has 6 divisors (see below), whose sum is σ = 54422802. Its totient is φ = 48851280.

The previous prime is 51565597. The next prime is 51565649. The reversal of 51565601 is 10656515.

It can be written as a sum of positive squares in only one way, i.e., 31629376 + 19936225 = 5624^2 + 4465^2 .

It is not a de Polignac number, because 51565601 - 2² = 51565597 is a prime.

It is a super-2 number, since 2×51565601² = 5318022412982402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51565681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71060 + ... + 71781.

It is an arithmetic number, because the mean of its divisors is an integer number (9070467).

Almost surely, 2^51565601 is an apocalyptic number.

It is an amenable number.

51565601 is a deficient number, since it is larger than the sum of its proper divisors (2857201).

51565601 is a wasteful number, since it uses less digits than its factorization.

51565601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142879 (or 142860 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51565601 is about 7180.9192308506. The cubic root of 51565601 is about 372.2088495612.

The spelling of 51565601 in words is "fifty-one million, five hundred sixty-five thousand, six hundred one".