215901113 has 4 divisors (see below), whose sum is σ = 216071460. Its totient is φ = 215730768.

The previous prime is 215901109. The next prime is 215901137. The reversal of 215901113 is 311109512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103286569 + 112614544 = 10163^2 + 10612^2 .

It is a cyclic number.

It is not a de Polignac number, because 215901113 - 2² = 215901109 is a prime.

It is a super-2 number, since 2×215901113² = 93226581189277538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215901163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83258 + ... + 85811.

It is an arithmetic number, because the mean of its divisors is an integer number (54017865).

Almost surely, 2^215901113 is an apocalyptic number.

It is an amenable number.

215901113 is a deficient number, since it is larger than the sum of its proper divisors (170347).

215901113 is a wasteful number, since it uses less digits than its factorization.

215901113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170346.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 215901113 is about 14693.5738675109. The cubic root of 215901113 is about 599.9084239867.

The spelling of 215901113 in words is "two hundred fifteen million, nine hundred one thousand, one hundred thirteen".