51972779 has 4 divisors (see below), whose sum is σ = 52015320. Its totient is φ = 51930240.

The previous prime is 51972773. The next prime is 51972797. The reversal of 51972779 is 97727915.

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

It is a cyclic number.

It is not a de Polignac number, because 51972779 - 2⁴ = 51972763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51972773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19382 + ... + 21899.

It is an arithmetic number, because the mean of its divisors is an integer number (13003830).

Almost surely, 2^51972779 is an apocalyptic number.

51972779 is a deficient number, since it is larger than the sum of its proper divisors (42541).

51972779 is a wasteful number, since it uses less digits than its factorization.

51972779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42540.

The product of its digits is 277830, while the sum is 47.

The square root of 51972779 is about 7209.2148670989. The cubic root of 51972779 is about 373.1859743866.

The spelling of 51972779 in words is "fifty-one million, nine hundred seventy-two thousand, seven hundred seventy-nine".