215232681 has 4 divisors (see below), whose sum is σ = 286976912. Its totient is φ = 143488452.

The previous prime is 215232679. The next prime is 215232683. The reversal of 215232681 is 186232512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (215232679) and next prime (215232683).

It is not a de Polignac number, because 215232681 - 2¹ = 215232679 is a prime.

It is a super-2 number, since 2×215232681² = 92650213940895522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215232683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35872111 + ... + 35872116.

It is an arithmetic number, because the mean of its divisors is an integer number (71744228).

Almost surely, 2^215232681 is an apocalyptic number.

It is an amenable number.

215232681 is a deficient number, since it is larger than the sum of its proper divisors (71744231).

215232681 is an equidigital number, since it uses as much as digits as its factorization.

215232681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71744230.

The product of its digits is 5760, while the sum is 30.

The square root of 215232681 is about 14670.8105093072. The cubic root of 215232681 is about 599.2886764758.

The spelling of 215232681 in words is "two hundred fifteen million, two hundred thirty-two thousand, six hundred eighty-one".