51555402 has 24 divisors (see below), whose sum is σ = 111835620. Its totient is φ = 17164800.

The previous prime is 51555389. The next prime is 51555419. The reversal of 51555402 is 20455515.

It can be written as a sum of positive squares in 2 ways, for example, as 33074001 + 18481401 = 5751^2 + 4299^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27924 + ... + 29712.

Almost surely, 2^51555402 is an apocalyptic number.

51555402 is an abundant number, since it is smaller than the sum of its proper divisors (60280218).

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

51555402 is a wasteful number, since it uses less digits than its factorization.

51555402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3398 (or 3395 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 51555402 is about 7180.2090498815. The cubic root of 51555402 is about 372.1843085993.

The spelling of 51555402 in words is "fifty-one million, five hundred fifty-five thousand, four hundred two".