51505575 has 48 divisors (see below), whose sum is σ = 93744000. Its totient is φ = 24745600.

The previous prime is 51505549. The next prime is 51505603. The reversal of 51505575 is 57550515.

It is not a de Polignac number, because 51505575 - 2⁵ = 51505543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122716 + ... + 123134.

It is an arithmetic number, because the mean of its divisors is an integer number (1953000).

Almost surely, 2^51505575 is an apocalyptic number.

51505575 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51505575 is a deficient number, since it is larger than the sum of its proper divisors (42238425).

51505575 is a wasteful number, since it uses less digits than its factorization.

51505575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 587 counting only the distinct ones).

The product of its (nonzero) digits is 21875, while the sum is 33.

The square root of 51505575 is about 7176.7384653476. The cubic root of 51505575 is about 372.0643676916.

The spelling of 51505575 in words is "fifty-one million, five hundred five thousand, five hundred seventy-five".