51644977 has 4 divisors (see below), whose sum is σ = 53310976. Its totient is φ = 49978980.

The previous prime is 51644947. The next prime is 51644987. The reversal of 51644977 is 77944615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51644977 - 2¹⁹ = 51120689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51644927) 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, 832953 + ... + 833014.

It is an arithmetic number, because the mean of its divisors is an integer number (13327744).

Almost surely, 2^51644977 is an apocalyptic number.

It is an amenable number.

51644977 is a deficient number, since it is larger than the sum of its proper divisors (1665999).

51644977 is a wasteful number, since it uses less digits than its factorization.

51644977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665998.

The product of its digits is 211680, while the sum is 43.

The square root of 51644977 is about 7186.4439745955. The cubic root of 51644977 is about 372.3997345864.

The spelling of 51644977 in words is "fifty-one million, six hundred forty-four thousand, nine hundred seventy-seven".