51555456 has 48 divisors (see below), whose sum is σ = 148359510. Its totient is φ = 17184768.

The previous prime is 51555451. The next prime is 51555461. The reversal of 51555456 is 65455515.

51555456 is a `hidden beast` number, since 51 + 5 + 554 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (51555451) and next prime (51555461).

It can be written as a sum of positive squares in only one way, i.e., 46785600 + 4769856 = 6840^2 + 2184^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51555456.

It is not an unprimeable number, because it can be changed into a prime (51555451) 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, 21225 + ... + 23528.

Almost surely, 2^51555456 is an apocalyptic number.

It is an amenable number.

51555456 is an abundant number, since it is smaller than the sum of its proper divisors (96804054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51555456 is a wasteful number, since it uses less digits than its factorization.

51555456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44773 (or 44758 counting only the distinct ones).

The product of its digits is 75000, while the sum is 36.

The square root of 51555456 is about 7180.2128102167. The cubic root of 51555456 is about 372.1844385433.

The spelling of 51555456 in words is "fifty-one million, five hundred fifty-five thousand, four hundred fifty-six".