51875905 has 4 divisors (see below), whose sum is σ = 62251092. Its totient is φ = 41500720.

The previous prime is 51875861. The next prime is 51875911. The reversal of 51875905 is 50957815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50957815 = 5 ⋅10191563.

It can be written as a sum of positive squares in 2 ways, for example, as 13535041 + 38340864 = 3679^2 + 6192^2 .

It is not a de Polignac number, because 51875905 - 2⁷ = 51875777 is a prime.

It is a super-2 number, since 2×51875905² = 5382219039138050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5187586 + ... + 5187595.

It is an arithmetic number, because the mean of its divisors is an integer number (15562773).

Almost surely, 2^51875905 is an apocalyptic number.

It is an amenable number.

51875905 is a deficient number, since it is larger than the sum of its proper divisors (10375187).

51875905 is a wasteful number, since it uses less digits than its factorization.

51875905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10375186.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 51875905 is about 7202.4929711871. The cubic root of 51875905 is about 372.9539650940.

The spelling of 51875905 in words is "fifty-one million, eight hundred seventy-five thousand, nine hundred five".