51555595 has 24 divisors (see below), whose sum is σ = 77508144. Its totient is φ = 32630976.

The previous prime is 51555589. The next prime is 51555601. The reversal of 51555595 is 59555515.

It is an interprime number because it is at equal distance from previous prime (51555589) and next prime (51555601).

It is not a de Polignac number, because 51555595 - 2³ = 51555587 is a prime.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4909 + ... + 11278.

It is an arithmetic number, because the mean of its divisors is an integer number (3229506).

Almost surely, 2^51555595 is an apocalyptic number.

51555595 is a deficient number, since it is larger than the sum of its proper divisors (25952549).

51555595 is a wasteful number, since it uses less digits than its factorization.

51555595 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16219 (or 16212 counting only the distinct ones).

The product of its digits is 140625, while the sum is 40.

The square root of 51555595 is about 7180.2224895890. Note that the first 3 decimals coincide. The cubic root of 51555595 is about 372.1847730283.

The spelling of 51555595 in words is "fifty-one million, five hundred fifty-five thousand, five hundred ninety-five".