53215515 has 32 divisors (see below), whose sum is σ = 96629760. Its totient is φ = 27774432.

The previous prime is 53215489. The next prime is 53215529. The reversal of 53215515 is 51551235.

It is not a de Polignac number, because 53215515 - 2¹⁶ = 53149979 is a prime.

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

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, 2152 + ... + 10538.

It is an arithmetic number, because the mean of its divisors is an integer number (3019680).

Almost surely, 2^53215515 is an apocalyptic number.

53215515 is a deficient number, since it is larger than the sum of its proper divisors (43414245).

53215515 is a wasteful number, since it uses less digits than its factorization.

53215515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8448 (or 8442 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 53215515 is about 7294.8965037209. The cubic root of 53215515 is about 376.1370289560.

The spelling of 53215515 in words is "fifty-three million, two hundred fifteen thousand, five hundred fifteen".