231331430387 has 2 divisors, whose sum is σ = 231331430388. Its totient is φ = 231331430386.

The previous prime is 231331430273. The next prime is 231331430411. The reversal of 231331430387 is 783034133132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231331430387 - 2⁸ = 231331430131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231331430387.

It is not a weakly prime, because it can be changed into another prime (231331450387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115665715193 + 115665715194.

It is an arithmetic number, because the mean of its divisors is an integer number (115665715194).

Almost surely, 2^231331430387 is an apocalyptic number.

231331430387 is a deficient number, since it is larger than the sum of its proper divisors (1).

231331430387 is an equidigital number, since it uses as much as digits as its factorization.

231331430387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 38.

The spelling of 231331430387 in words is "two hundred thirty-one billion, three hundred thirty-one million, four hundred thirty thousand, three hundred eighty-seven".