51249590 has 48 divisors (see below), whose sum is σ = 109970784. Its totient is φ = 17136000.

The previous prime is 51249587. The next prime is 51249619. The reversal of 51249590 is 9594215.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 51249590.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 18815 + ... + 21365.

It is an arithmetic number, because the mean of its divisors is an integer number (2291058).

Almost surely, 2^51249590 is an apocalyptic number.

51249590 is an abundant number, since it is smaller than the sum of its proper divisors (58721194).

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

51249590 is a wasteful number, since it uses less digits than its factorization.

51249590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613 (or 2606 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 51249590 is about 7158.8818959388. The cubic root of 51249590 is about 371.4469515418.

The spelling of 51249590 in words is "fifty-one million, two hundred forty-nine thousand, five hundred ninety".