51539535 has 12 divisors (see below), whose sum is σ = 89335272. Its totient is φ = 27487728.

The previous prime is 51539531. The next prime is 51539561. The reversal of 51539535 is 53593515.

It is not a de Polignac number, because 51539535 - 2² = 51539531 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 51539535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51539531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 572617 + ... + 572706.

It is an arithmetic number, because the mean of its divisors is an integer number (7444606).

Almost surely, 2^51539535 is an apocalyptic number.

51539535 is a deficient number, since it is larger than the sum of its proper divisors (37795737).

51539535 is a wasteful number, since it uses less digits than its factorization.

51539535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145334 (or 1145331 counting only the distinct ones).

The product of its digits is 50625, while the sum is 36.

The square root of 51539535 is about 7179.1040527353. The cubic root of 51539535 is about 372.1461227892.

The spelling of 51539535 in words is "fifty-one million, five hundred thirty-nine thousand, five hundred thirty-five".