215505157 has 8 divisors (see below), whose sum is σ = 248231936. Its totient is φ = 183263472.

The previous prime is 215505139. The next prime is 215505161. The reversal of 215505157 is 751505512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215505157 - 2⁷ = 215505029 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 (215505137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120318 + ... + 122095.

It is an arithmetic number, because the mean of its divisors is an integer number (31028992).

Almost surely, 2^215505157 is an apocalyptic number.

It is an amenable number.

215505157 is a deficient number, since it is larger than the sum of its proper divisors (32726779).

215505157 is a wasteful number, since it uses less digits than its factorization.

215505157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242547.

The product of its (nonzero) digits is 8750, while the sum is 31.

The square root of 215505157 is about 14680.0939029694. The cubic root of 215505157 is about 599.5414616973.

The spelling of 215505157 in words is "two hundred fifteen million, five hundred five thousand, one hundred fifty-seven".