53139813 has 8 divisors (see below), whose sum is σ = 72581376. Its totient is φ = 34562400.

The previous prime is 53139809. The next prime is 53139817. The reversal of 53139813 is 31893135.

It is an interprime number because it is at equal distance from previous prime (53139809) and next prime (53139817).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53139813 - 2² = 53139809 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53139817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215893 + ... + 216138.

It is an arithmetic number, because the mean of its divisors is an integer number (9072672).

Almost surely, 2^53139813 is an apocalyptic number.

It is an amenable number.

53139813 is a deficient number, since it is larger than the sum of its proper divisors (19441563).

53139813 is a wasteful number, since it uses less digits than its factorization.

53139813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432075.

The product of its digits is 9720, while the sum is 33.

The square root of 53139813 is about 7289.7059611482. The cubic root of 53139813 is about 375.9585857698.

The spelling of 53139813 in words is "fifty-three million, one hundred thirty-nine thousand, eight hundred thirteen".