51539771 has 4 divisors (see below), whose sum is σ = 51651552. Its totient is φ = 51427992.

The previous prime is 51539753. The next prime is 51539783. The reversal of 51539771 is 17793515.

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 51539771 - 2¹⁴ = 51523387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51539171) 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, 55196 + ... + 56121.

It is an arithmetic number, because the mean of its divisors is an integer number (12912888).

Almost surely, 2^51539771 is an apocalyptic number.

51539771 is a deficient number, since it is larger than the sum of its proper divisors (111781).

51539771 is a wasteful number, since it uses less digits than its factorization.

51539771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111780.

The product of its digits is 33075, while the sum is 38.

The square root of 51539771 is about 7179.1204893079. The cubic root of 51539771 is about 372.1466908085.

The spelling of 51539771 in words is "fifty-one million, five hundred thirty-nine thousand, seven hundred seventy-one".