51556361 has 4 divisors (see below), whose sum is σ = 51579924. Its totient is φ = 51532800.

The previous prime is 51556331. The next prime is 51556369. The reversal of 51556361 is 16365515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19971961 + 31584400 = 4469^2 + 5620^2 .

It is a cyclic number.

It is not a de Polignac number, because 51556361 - 2¹⁴ = 51539977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51556369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8120 + ... + 13001.

It is an arithmetic number, because the mean of its divisors is an integer number (12894981).

Almost surely, 2^51556361 is an apocalyptic number.

It is an amenable number.

51556361 is a deficient number, since it is larger than the sum of its proper divisors (23563).

51556361 is a wasteful number, since it uses less digits than its factorization.

51556361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23562.

The product of its digits is 13500, while the sum is 32.

The square root of 51556361 is about 7180.2758303564. The cubic root of 51556361 is about 372.1866162950.

The spelling of 51556361 in words is "fifty-one million, five hundred fifty-six thousand, three hundred sixty-one".