215157945 has 16 divisors (see below), whose sum is σ = 348122880. Its totient is φ = 113460864.

The previous prime is 215157941. The next prime is 215157947. The reversal of 215157945 is 549751512.

215157945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215157945 - 2² = 215157941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215157941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79249 + ... + 81918.

It is an arithmetic number, because the mean of its divisors is an integer number (21757680).

Almost surely, 2^215157945 is an apocalyptic number.

It is an amenable number.

215157945 is a deficient number, since it is larger than the sum of its proper divisors (132964935).

215157945 is a wasteful number, since it uses less digits than its factorization.

215157945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161264.

The product of its digits is 63000, while the sum is 39.

The square root of 215157945 is about 14668.2631896213. The cubic root of 215157945 is about 599.2193040748.

The spelling of 215157945 in words is "two hundred fifteen million, one hundred fifty-seven thousand, nine hundred forty-five".