51187975 has 18 divisors (see below), whose sum is σ = 65776544. Its totient is φ = 39475200.

The previous prime is 51187963. The next prime is 51187993. The reversal of 51187975 is 57978115.

It is not a de Polignac number, because 51187975 - 2⁷ = 51187847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 199047 + ... + 199303.

Almost surely, 2^51187975 is an apocalyptic number.

51187975 is a deficient number, since it is larger than the sum of its proper divisors (14588569).

51187975 is an equidigital number, since it uses as much as digits as its factorization.

51187975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555 (or 293 counting only the distinct ones).

The product of its digits is 88200, while the sum is 43.

The square root of 51187975 is about 7154.5772062366. The cubic root of 51187975 is about 371.2980340453.

The spelling of 51187975 in words is "fifty-one million, one hundred eighty-seven thousand, nine hundred seventy-five".