215564053 has 4 divisors (see below), whose sum is σ = 215594560. Its totient is φ = 215533548.

The previous prime is 215564033. The next prime is 215564059. The reversal of 215564053 is 350465512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 215564053 - 2⁵ = 215564021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215564059) 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, 1426 + ... + 20812.

It is an arithmetic number, because the mean of its divisors is an integer number (53898640).

Almost surely, 2^215564053 is an apocalyptic number.

It is an amenable number.

215564053 is a deficient number, since it is larger than the sum of its proper divisors (30507).

215564053 is a wasteful number, since it uses less digits than its factorization.

215564053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30506.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 215564053 is about 14682.0997476519. The cubic root of 215564053 is about 599.5960735037.

The spelling of 215564053 in words is "two hundred fifteen million, five hundred sixty-four thousand, fifty-three".