51172655 has 4 divisors (see below), whose sum is σ = 61407192. Its totient is φ = 40938120.

The previous prime is 51172621. The next prime is 51172663. The reversal of 51172655 is 55627115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55627115 = 5 ⋅11125423.

It is not a de Polignac number, because 51172655 - 2¹⁴ = 51156271 is a prime.

It is a Duffinian number.

It is a congruent 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, 5117261 + ... + 5117270.

It is an arithmetic number, because the mean of its divisors is an integer number (15351798).

Almost surely, 2^51172655 is an apocalyptic number.

51172655 is a deficient number, since it is larger than the sum of its proper divisors (10234537).

51172655 is a wasteful number, since it uses less digits than its factorization.

51172655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10234536.

The product of its digits is 10500, while the sum is 32.

The square root of 51172655 is about 7153.5064828376. The cubic root of 51172655 is about 371.2609885383.

The spelling of 51172655 in words is "fifty-one million, one hundred seventy-two thousand, six hundred fifty-five".