51644455 has 4 divisors (see below), whose sum is σ = 61973352. Its totient is φ = 41315560.

The previous prime is 51644441. The next prime is 51644501. The reversal of 51644455 is 55444615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55444615 = 5 ⋅11088923.

It is not a de Polignac number, because 51644455 - 2¹¹ = 51642407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51644455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5164441 + ... + 5164450.

It is an arithmetic number, because the mean of its divisors is an integer number (15493338).

Almost surely, 2^51644455 is an apocalyptic number.

51644455 is a deficient number, since it is larger than the sum of its proper divisors (10328897).

51644455 is a wasteful number, since it uses less digits than its factorization.

51644455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10328896.

The product of its digits is 48000, while the sum is 34.

The square root of 51644455 is about 7186.4076561242. The cubic root of 51644455 is about 372.3984799093.

The spelling of 51644455 in words is "fifty-one million, six hundred forty-four thousand, four hundred fifty-five".