51015155 has 4 divisors (see below), whose sum is σ = 61218192. Its totient is φ = 40812120.

The previous prime is 51015143. The next prime is 51015191. The reversal of 51015155 is 55151015.

It is a happy number.

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

It is not a de Polignac number, because 51015155 - 2¹⁴ = 50998771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51015155.

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, 5101511 + ... + 5101520.

It is an arithmetic number, because the mean of its divisors is an integer number (15304548).

Almost surely, 2^51015155 is an apocalyptic number.

51015155 is a deficient number, since it is larger than the sum of its proper divisors (10203037).

51015155 is a wasteful number, since it uses less digits than its factorization.

51015155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10203036.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 51015155 is about 7142.4894119628. The cubic root of 51015155 is about 370.8797061339.

The spelling of 51015155 in words is "fifty-one million, fifteen thousand, one hundred fifty-five".