231262240478389 has 2 divisors, whose sum is σ = 231262240478390. Its totient is φ = 231262240478388.

The previous prime is 231262240478371. The next prime is 231262240478441. The reversal of 231262240478389 is 983874042262132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208568764448100 + 22693476030289 = 14441910^2 + 4763767^2 .

It is a cyclic number.

It is not a de Polignac number, because 231262240478389 - 2⁷ = 231262240478261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231262240478309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115631120239194 + 115631120239195.

It is an arithmetic number, because the mean of its divisors is an integer number (115631120239195).

Almost surely, 2^{231262240478389} is an apocalyptic number.

It is an amenable number.

231262240478389 is a deficient number, since it is larger than the sum of its proper divisors (1).

231262240478389 is an equidigital number, since it uses as much as digits as its factorization.

231262240478389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55738368, while the sum is 61.

The spelling of 231262240478389 in words is "two hundred thirty-one trillion, two hundred sixty-two billion, two hundred forty million, four hundred seventy-eight thousand, three hundred eighty-nine".