51061590 has 48 divisors (see below), whose sum is σ = 137683728. Its totient is φ = 13615776.

The previous prime is 51061583. The next prime is 51061601. The reversal of 51061590 is 9516015.

51061590 is a `hidden beast` number, since 5 + 10 + 61 + 590 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8077 + ... + 12936.

It is an arithmetic number, because the mean of its divisors is an integer number (2868411).

Almost surely, 2^51061590 is an apocalyptic number.

51061590 is an abundant number, since it is smaller than the sum of its proper divisors (86622138).

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

51061590 is a wasteful number, since it uses less digits than its factorization.

51061590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21035 (or 21023 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 51061590 is about 7145.7392899545. The cubic root of 51061590 is about 370.9921993502.

The spelling of 51061590 in words is "fifty-one million, sixty-one thousand, five hundred ninety".