51620539 has 4 divisors (see below), whose sum is σ = 51727024. Its totient is φ = 51514056.

The previous prime is 51620531. The next prime is 51620567. The reversal of 51620539 is 93502615.

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 51620539 - 2³ = 51620531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51620539.

It is not an unprimeable number, because it can be changed into a prime (51620531) 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, 52512 + ... + 53485.

It is an arithmetic number, because the mean of its divisors is an integer number (12931756).

Almost surely, 2^51620539 is an apocalyptic number.

51620539 is a deficient number, since it is larger than the sum of its proper divisors (106485).

51620539 is a wasteful number, since it uses less digits than its factorization.

51620539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106484.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 51620539 is about 7184.7434888102. The cubic root of 51620539 is about 372.3409864365.

The spelling of 51620539 in words is "fifty-one million, six hundred twenty thousand, five hundred thirty-nine".