51841520 has 20 divisors (see below), whose sum is σ = 120531720. Its totient is φ = 20736576.

The previous prime is 51841511. The next prime is 51841541. The reversal of 51841520 is 2514815.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 51841520.

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, 323930 + ... + 324089.

It is an arithmetic number, because the mean of its divisors is an integer number (6026586).

Almost surely, 2^51841520 is an apocalyptic number.

It is an amenable number.

51841520 is an abundant number, since it is smaller than the sum of its proper divisors (68690200).

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

51841520 is a wasteful number, since it uses less digits than its factorization.

51841520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648032 (or 648026 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 51841520 is about 7200.1055547818. The cubic root of 51841520 is about 372.8715449639.

The spelling of 51841520 in words is "fifty-one million, eight hundred forty-one thousand, five hundred twenty".