231644633 has 16 divisors (see below), whose sum is σ = 259566720. Its totient is φ = 204940800.

The previous prime is 231644591. The next prime is 231644659. The reversal of 231644633 is 336446132.

It is a cyclic number.

It is not a de Polignac number, because 231644633 - 2¹² = 231640537 is a prime.

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 231644633.

It is not an unprimeable number, because it can be changed into a prime (231644683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63308 + ... + 66866.

It is an arithmetic number, because the mean of its divisors is an integer number (16222920).

Almost surely, 2^231644633 is an apocalyptic number.

It is an amenable number.

231644633 is a deficient number, since it is larger than the sum of its proper divisors (27922087).

231644633 is a wasteful number, since it uses less digits than its factorization.

231644633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3728.

The product of its digits is 31104, while the sum is 32.

The square root of 231644633 is about 15219.8762478543. The cubic root of 231644633 is about 614.1494691760.

The spelling of 231644633 in words is "two hundred thirty-one million, six hundred forty-four thousand, six hundred thirty-three".