232640381 has 2 divisors, whose sum is σ = 232640382. Its totient is φ = 232640380.

The previous prime is 232640347. The next prime is 232640383. The reversal of 232640381 is 183046232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157904356 + 74736025 = 12566^2 + 8645^2 .

It is a cyclic number.

It is not a de Polignac number, because 232640381 - 2¹⁴ = 232623997 is a prime.

It is a super-2 number, since 2×232640381² = 108243093743650322, which contains 22 as substring.

Together with 232640383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (232640383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116320190 + 116320191.

It is an arithmetic number, because the mean of its divisors is an integer number (116320191).

Almost surely, 2^232640381 is an apocalyptic number.

It is an amenable number.

232640381 is a deficient number, since it is larger than the sum of its proper divisors (1).

232640381 is an equidigital number, since it uses as much as digits as its factorization.

232640381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 232640381 is about 15252.5532616674. The cubic root of 232640381 is about 615.0282059023.

The spelling of 232640381 in words is "two hundred thirty-two million, six hundred forty thousand, three hundred eighty-one".