51538779 has 6 divisors (see below), whose sum is σ = 74444916. Its totient is φ = 34359180.

The previous prime is 51538777. The next prime is 51538783. The reversal of 51538779 is 97783515.

It is not a de Polignac number, because 51538779 - 2¹ = 51538777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51538777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2863257 + ... + 2863274.

It is an arithmetic number, because the mean of its divisors is an integer number (12407486).

Almost surely, 2^51538779 is an apocalyptic number.

51538779 is a deficient number, since it is larger than the sum of its proper divisors (22906137).

51538779 is a wasteful number, since it uses less digits than its factorization.

51538779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5726537 (or 5726534 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 51538779 is about 7179.0513997324. The cubic root of 51538779 is about 372.1443031903.

The spelling of 51538779 in words is "fifty-one million, five hundred thirty-eight thousand, seven hundred seventy-nine".