231705407 has 2 divisors, whose sum is σ = 231705408. Its totient is φ = 231705406.

The previous prime is 231705343. The next prime is 231705469. The reversal of 231705407 is 704507132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231705407 - 2⁶ = 231705343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231705407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231705007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115852703 + 115852704.

It is an arithmetic number, because the mean of its divisors is an integer number (115852704).

Almost surely, 2^231705407 is an apocalyptic number.

231705407 is a deficient number, since it is larger than the sum of its proper divisors (1).

231705407 is an equidigital number, since it uses as much as digits as its factorization.

231705407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 231705407 is about 15221.8726508929. The cubic root of 231705407 is about 614.2031736453.

The spelling of 231705407 in words is "two hundred thirty-one million, seven hundred five thousand, four hundred seven".