233661213 has 16 divisors (see below), whose sum is σ = 351043200. Its totient is φ = 153578880.

The previous prime is 233661191. The next prime is 233661251. The reversal of 233661213 is 312166332.

It is a happy number.

233661213 is a `hidden beast` number, since 2 + 3 + 36 + 612 + 13 = 666.

It is not a de Polignac number, because 233661213 - 2²¹ = 231564061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233661283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59028 + ... + 62861.

It is an arithmetic number, because the mean of its divisors is an integer number (21940200).

Almost surely, 2^233661213 is an apocalyptic number.

It is an amenable number.

233661213 is a deficient number, since it is larger than the sum of its proper divisors (117381987).

233661213 is a wasteful number, since it uses less digits than its factorization.

233661213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121969 (or 121963 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 233661213 is about 15285.9809302511. The cubic root of 233661213 is about 615.9264798480.

The spelling of 233661213 in words is "two hundred thirty-three million, six hundred sixty-one thousand, two hundred thirteen".