51508775 has 6 divisors (see below), whose sum is σ = 63870912. Its totient is φ = 41207000.

The previous prime is 51508771. The next prime is 51508781. The reversal of 51508775 is 57780515.

It is not a de Polignac number, because 51508775 - 2² = 51508771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51508771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1030151 + ... + 1030200.

It is an arithmetic number, because the mean of its divisors is an integer number (10645152).

Almost surely, 2^51508775 is an apocalyptic number.

51508775 is a deficient number, since it is larger than the sum of its proper divisors (12362137).

51508775 is a wasteful number, since it uses less digits than its factorization.

51508775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060361 (or 2060356 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 38.

The square root of 51508775 is about 7176.9614043828. The cubic root of 51508775 is about 372.0720728855.

The spelling of 51508775 in words is "fifty-one million, five hundred eight thousand, seven hundred seventy-five".