51779915 has 8 divisors (see below), whose sum is σ = 67784688. Its totient is φ = 37658080.

The previous prime is 51779899. The next prime is 51779929. The reversal of 51779915 is 51997715.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51779915 - 2⁴ = 51779899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470672 + ... + 470781.

It is an arithmetic number, because the mean of its divisors is an integer number (8473086).

Almost surely, 2^51779915 is an apocalyptic number.

51779915 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51779915 is a deficient number, since it is larger than the sum of its proper divisors (16004773).

51779915 is a wasteful number, since it uses less digits than its factorization.

51779915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941469.

The product of its digits is 99225, while the sum is 44.

The square root of 51779915 is about 7195.8262208033. The cubic root of 51779915 is about 372.7237878732.

The spelling of 51779915 in words is "fifty-one million, seven hundred seventy-nine thousand, nine hundred fifteen".