51240279 has 8 divisors (see below), whose sum is σ = 68353792. Its totient is φ = 34143480.

The previous prime is 51240253. The next prime is 51240307. The reversal of 51240279 is 97204215.

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

It is not a de Polignac number, because 51240279 - 2⁹ = 51239767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8322 + ... + 13104.

It is an arithmetic number, because the mean of its divisors is an integer number (8544224).

Almost surely, 2^51240279 is an apocalyptic number.

51240279 is a deficient number, since it is larger than the sum of its proper divisors (17113513).

51240279 is a wasteful number, since it uses less digits than its factorization.

51240279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8357.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 51240279 is about 7158.2315553494. The cubic root of 51240279 is about 371.4244554137.

The spelling of 51240279 in words is "fifty-one million, two hundred forty thousand, two hundred seventy-nine".