215164551 has 16 divisors (see below), whose sum is σ = 328256000. Its totient is φ = 122806368.

The previous prime is 215164541. The next prime is 215164553. The reversal of 215164551 is 155461512.

215164551 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 215164551 - 2⁷ = 215164423 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 (215164553) 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, 13725 + ... + 24873.

It is an arithmetic number, because the mean of its divisors is an integer number (20516000).

Almost surely, 2^215164551 is an apocalyptic number.

215164551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

215164551 is a deficient number, since it is larger than the sum of its proper divisors (113091449).

215164551 is a wasteful number, since it uses less digits than its factorization.

215164551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12078.

The product of its digits is 6000, while the sum is 30.

The square root of 215164551 is about 14668.4883679267. The cubic root of 215164551 is about 599.2254366274.

The spelling of 215164551 in words is "two hundred fifteen million, one hundred sixty-four thousand, five hundred fifty-one".