215523132 has 24 divisors (see below), whose sum is σ = 548604672. Its totient is φ = 65310000.

The previous prime is 215523131. The next prime is 215523149. The reversal of 215523132 is 231325512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215523131) 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, 816244 + ... + 816507.

It is an arithmetic number, because the mean of its divisors is an integer number (22858528).

Almost surely, 2^215523132 is an apocalyptic number.

215523132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

215523132 is an abundant number, since it is smaller than the sum of its proper divisors (333081540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215523132 is a wasteful number, since it uses less digits than its factorization.

215523132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632769 (or 1632767 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 215523132 is about 14680.7061138080. The cubic root of 215523132 is about 599.5581302206.

Adding to 215523132 its reverse (231325512), we get a palindrome (446848644).

The spelling of 215523132 in words is "two hundred fifteen million, five hundred twenty-three thousand, one hundred thirty-two".