51565794 has 32 divisors (see below), whose sum is σ = 124799616. Its totient is φ = 13866240.

The previous prime is 51565781. The next prime is 51565807. The reversal of 51565794 is 49756515.

It is an interprime number because it is at equal distance from previous prime (51565781) and next prime (51565807).

It is a super-2 number, since 2×51565794² = 5318062221700872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35397 + ... + 36824.

It is an arithmetic number, because the mean of its divisors is an integer number (3899988).

Almost surely, 2^51565794 is an apocalyptic number.

51565794 is an abundant number, since it is smaller than the sum of its proper divisors (73233822).

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

51565794 is a wasteful number, since it uses less digits than its factorization.

51565794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72250.

The product of its digits is 189000, while the sum is 42.

The square root of 51565794 is about 7180.9326692290. The cubic root of 51565794 is about 372.2093139291.

The spelling of 51565794 in words is "fifty-one million, five hundred sixty-five thousand, seven hundred ninety-four".