215142891 has 8 divisors (see below), whose sum is σ = 287214144. Its totient is φ = 143250120.

The previous prime is 215142881. The next prime is 215142911. The reversal of 215142891 is 198241512.

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

It is not a de Polignac number, because 215142891 - 2⁵ = 215142859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215142881) 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, 41781 + ... + 46646.

It is an arithmetic number, because the mean of its divisors is an integer number (35901768).

Almost surely, 2^215142891 is an apocalyptic number.

215142891 is a deficient number, since it is larger than the sum of its proper divisors (72071253).

215142891 is an equidigital number, since it uses as much as digits as its factorization.

215142891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89241.

The product of its digits is 5760, while the sum is 33.

The square root of 215142891 is about 14667.7500319579. The cubic root of 215142891 is about 599.2053285156.

The spelling of 215142891 in words is "two hundred fifteen million, one hundred forty-two thousand, eight hundred ninety-one".