232643821 has 2 divisors, whose sum is σ = 232643822. Its totient is φ = 232643820.

The previous prime is 232643779. The next prime is 232643833. The reversal of 232643821 is 128346232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210685225 + 21958596 = 14515^2 + 4686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-232643821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (232643891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116321910 + 116321911.

It is an arithmetic number, because the mean of its divisors is an integer number (116321911).

Almost surely, 2^232643821 is an apocalyptic number.

It is an amenable number.

232643821 is a deficient number, since it is larger than the sum of its proper divisors (1).

232643821 is an equidigital number, since it uses as much as digits as its factorization.

232643821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 31.

The square root of 232643821 is about 15252.6660292553. Note that the first 3 decimals coincide. The cubic root of 232643821 is about 615.0312373144.

The spelling of 232643821 in words is "two hundred thirty-two million, six hundred forty-three thousand, eight hundred twenty-one".