53131815 has 64 divisors (see below), whose sum is σ = 105937920. Its totient is φ = 25038720.

The previous prime is 53131787. The next prime is 53131831. The reversal of 53131815 is 51813135.

It is not a de Polignac number, because 53131815 - 2¹¹ = 53129767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54462 + ... + 55428.

It is an arithmetic number, because the mean of its divisors is an integer number (1655280).

Almost surely, 2^53131815 is an apocalyptic number.

53131815 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

53131815 is a deficient number, since it is larger than the sum of its proper divisors (52806105).

53131815 is a wasteful number, since it uses less digits than its factorization.

53131815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1023 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 53131815 is about 7289.1573587075. The cubic root of 53131815 is about 375.9397231540.

The spelling of 53131815 in words is "fifty-three million, one hundred thirty-one thousand, eight hundred fifteen".