53521215 has 32 divisors (see below), whose sum is σ = 93747456. Its totient is φ = 25858560.

The previous prime is 53521189. The next prime is 53521267. The reversal of 53521215 is 51212535.

It is a happy number.

It is not a de Polignac number, because 53521215 - 2⁷ = 53521087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89959 + ... + 90551.

It is an arithmetic number, because the mean of its divisors is an integer number (2929608).

Almost surely, 2^53521215 is an apocalyptic number.

53521215 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

53521215 is a deficient number, since it is larger than the sum of its proper divisors (40226241).

53521215 is a wasteful number, since it uses less digits than its factorization.

53521215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159.

The product of its digits is 1500, while the sum is 24.

The square root of 53521215 is about 7315.8195029675. The cubic root of 53521215 is about 376.8559020764.

The spelling of 53521215 in words is "fifty-three million, five hundred twenty-one thousand, two hundred fifteen".