231802381 has 2 divisors, whose sum is σ = 231802382. Its totient is φ = 231802380.

The previous prime is 231802367. The next prime is 231802387. The reversal of 231802381 is 183208132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226984356 + 4818025 = 15066^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 231802381 - 2²⁵ = 198247949 is a prime.

It is a super-2 number, since 2×231802381² = 107464687674538322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231802387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115901190 + 115901191.

It is an arithmetic number, because the mean of its divisors is an integer number (115901191).

Almost surely, 2^231802381 is an apocalyptic number.

It is an amenable number.

231802381 is a deficient number, since it is larger than the sum of its proper divisors (1).

231802381 is an equidigital number, since it uses as much as digits as its factorization.

231802381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 231802381 is about 15225.0576681995. The cubic root of 231802381 is about 614.2888477087.

The spelling of 231802381 in words is "two hundred thirty-one million, eight hundred two thousand, three hundred eighty-one".