231404377 has 2 divisors, whose sum is σ = 231404378. Its totient is φ = 231404376.

The previous prime is 231404339. The next prime is 231404419. The reversal of 231404377 is 773404132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209351961 + 22052416 = 14469^2 + 4696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231404377 is a prime.

It is not a weakly prime, because it can be changed into another prime (231404317) 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 as a sum of consecutive naturals, namely, 115702188 + 115702189.

It is an arithmetic number, because the mean of its divisors is an integer number (115702189).

Almost surely, 2^231404377 is an apocalyptic number.

It is an amenable number.

231404377 is a deficient number, since it is larger than the sum of its proper divisors (1).

231404377 is an equidigital number, since it uses as much as digits as its factorization.

231404377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 231404377 is about 15211.9813633859. The cubic root of 231404377 is about 613.9370689215.

The spelling of 231404377 in words is "two hundred thirty-one million, four hundred four thousand, three hundred seventy-seven".