231023549 has 2 divisors, whose sum is σ = 231023550. Its totient is φ = 231023548.

The previous prime is 231023543. The next prime is 231023579. The reversal of 231023549 is 945320132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206123449 + 24900100 = 14357^2 + 4990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231023549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231023543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115511774 + 115511775.

It is an arithmetic number, because the mean of its divisors is an integer number (115511775).

Almost surely, 2^231023549 is an apocalyptic number.

It is an amenable number.

231023549 is a deficient number, since it is larger than the sum of its proper divisors (1).

231023549 is an equidigital number, since it uses as much as digits as its factorization.

231023549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 231023549 is about 15199.4588390508. The cubic root of 231023549 is about 613.6000934419.

The spelling of 231023549 in words is "two hundred thirty-one million, twenty-three thousand, five hundred forty-nine".