213455231 has 8 divisors (see below), whose sum is σ = 233056128. Its totient is φ = 193887000.

The previous prime is 213455227. The next prime is 213455239. The reversal of 213455231 is 132554312.

It is a happy number.

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 213455231 - 2² = 213455227 is a prime.

It is a super-2 number, since 2×213455231² = 91126271282526722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213455231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213455239) 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, 6686 + ... + 21716.

It is an arithmetic number, because the mean of its divisors is an integer number (29132016).

Almost surely, 2^213455231 is an apocalyptic number.

213455231 is a deficient number, since it is larger than the sum of its proper divisors (19600897).

213455231 is a wasteful number, since it uses less digits than its factorization.

213455231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16333.

The product of its digits is 3600, while the sum is 26.

The square root of 213455231 is about 14610.1071522422. The cubic root of 213455231 is about 597.6344180345.

The spelling of 213455231 in words is "two hundred thirteen million, four hundred fifty-five thousand, two hundred thirty-one".