51561601 has 16 divisors (see below), whose sum is σ = 64941184. Its totient is φ = 39844224.

The previous prime is 51561589. The next prime is 51561613. The reversal of 51561601 is 10616515.

It is an interprime number because it is at equal distance from previous prime (51561589) and next prime (51561613).

It is not a de Polignac number, because 51561601 - 2⁵ = 51561569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51561701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2676 + ... + 10501.

It is an arithmetic number, because the mean of its divisors is an integer number (4058824).

Almost surely, 2^51561601 is an apocalyptic number.

It is an amenable number.

51561601 is a deficient number, since it is larger than the sum of its proper divisors (13379583).

51561601 is a wasteful number, since it uses less digits than its factorization.

51561601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13240.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 51561601 is about 7180.6407095746. The cubic root of 51561601 is about 372.1992250967.

The spelling of 51561601 in words is "fifty-one million, five hundred sixty-one thousand, six hundred one".