50979721 has 8 divisors (see below), whose sum is σ = 55027784. Its totient is φ = 46949760.

The previous prime is 50979689. The next prime is 50979739. The reversal of 50979721 is 12797905.

It can be written as a sum of positive squares in 4 ways, for example, as 14400 + 50965321 = 120^2 + 7139^2 .

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

It is not a de Polignac number, because 50979721 - 2⁵ = 50979689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50979781) 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, 1651 + ... + 10231.

It is an arithmetic number, because the mean of its divisors is an integer number (6878473).

Almost surely, 2^50979721 is an apocalyptic number.

It is an amenable number.

50979721 is a deficient number, since it is larger than the sum of its proper divisors (4048063).

50979721 is a wasteful number, since it uses less digits than its factorization.

50979721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9051.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 50979721 is about 7140.0084733843. The cubic root of 50979721 is about 370.7938179612.

The spelling of 50979721 in words is "fifty million, nine hundred seventy-nine thousand, seven hundred twenty-one".