215513151 has 16 divisors (see below), whose sum is σ = 342680064. Its totient is φ = 117795744.

The previous prime is 215513149. The next prime is 215513161. The reversal of 215513151 is 151315512.

It is not a de Polignac number, because 215513151 - 2¹ = 215513149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215513141) 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, 222616 + ... + 223581.

It is an arithmetic number, because the mean of its divisors is an integer number (21417504).

Almost surely, 2^215513151 is an apocalyptic number.

215513151 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

215513151 is a deficient number, since it is larger than the sum of its proper divisors (127166913).

215513151 is a wasteful number, since it uses less digits than its factorization.

215513151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446230.

The product of its digits is 750, while the sum is 24.

The square root of 215513151 is about 14680.3661739072. The cubic root of 215513151 is about 599.5488747840.

Adding to 215513151 its reverse (151315512), we get a palindrome (366828663).

The spelling of 215513151 in words is "two hundred fifteen million, five hundred thirteen thousand, one hundred fifty-one".