215490161 has 8 divisors (see below), whose sum is σ = 218381184. Its totient is φ = 212606320.

The previous prime is 215490139. The next prime is 215490167. The reversal of 215490161 is 161094512.

215490161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 215490161 - 2²⁶ = 148381297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215490167) 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, 86840 + ... + 89286.

It is an arithmetic number, because the mean of its divisors is an integer number (27297648).

Almost surely, 2^215490161 is an apocalyptic number.

It is an amenable number.

215490161 is a deficient number, since it is larger than the sum of its proper divisors (2891023).

215490161 is a wasteful number, since it uses less digits than its factorization.

215490161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 215490161 is about 14679.5831344081. The cubic root of 215490161 is about 599.5275549423.

The spelling of 215490161 in words is "two hundred fifteen million, four hundred ninety thousand, one hundred sixty-one".