231831493 has 2 divisors, whose sum is σ = 231831494. Its totient is φ = 231831492.

The previous prime is 231831449. The next prime is 231831527. The reversal of 231831493 is 394138132.

It is an a-pointer prime, because the next prime (231831527) can be obtained adding 231831493 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153809604 + 78021889 = 12402^2 + 8833^2 .

It is a cyclic number.

It is not a de Polignac number, because 231831493 - 2⁹ = 231830981 is a prime.

It is a super-2 number, since 2×231831493² = 107491682293218098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231831403) 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, 115915746 + 115915747.

It is an arithmetic number, because the mean of its divisors is an integer number (115915747).

Almost surely, 2^231831493 is an apocalyptic number.

It is an amenable number.

231831493 is a deficient number, since it is larger than the sum of its proper divisors (1).

231831493 is an equidigital number, since it uses as much as digits as its factorization.

231831493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 231831493 is about 15226.0136936757. The cubic root of 231831493 is about 614.3145627571.

It can be divided in two parts, 231831 and 493, that added together give a square (232324 = 482²).

The spelling of 231831493 in words is "two hundred thirty-one million, eight hundred thirty-one thousand, four hundred ninety-three".