51279155 has 4 divisors (see below), whose sum is σ = 61534992. Its totient is φ = 41023320.

The previous prime is 51279139. The next prime is 51279169. The reversal of 51279155 is 55197215.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51279155 - 2⁴ = 51279139 is a prime.

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, 5127911 + ... + 5127920.

It is an arithmetic number, because the mean of its divisors is an integer number (15383748).

Almost surely, 2^51279155 is an apocalyptic number.

51279155 is a deficient number, since it is larger than the sum of its proper divisors (10255837).

51279155 is a wasteful number, since it uses less digits than its factorization.

51279155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10255836.

The product of its digits is 15750, while the sum is 35.

The square root of 51279155 is about 7160.9465156500. The cubic root of 51279155 is about 371.5183649135.

The spelling of 51279155 in words is "fifty-one million, two hundred seventy-nine thousand, one hundred fifty-five".