231026399 has 2 divisors, whose sum is σ = 231026400. Its totient is φ = 231026398.

The previous prime is 231026387. The next prime is 231026423. The reversal of 231026399 is 993620132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231026399 - 2¹² = 231022303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231026309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115513199 + 115513200.

It is an arithmetic number, because the mean of its divisors is an integer number (115513200).

Almost surely, 2^231026399 is an apocalyptic number.

231026399 is a deficient number, since it is larger than the sum of its proper divisors (1).

231026399 is an equidigital number, since it uses as much as digits as its factorization.

231026399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 231026399 is about 15199.5525920995. The cubic root of 231026399 is about 613.6026166379.

The spelling of 231026399 in words is "two hundred thirty-one million, twenty-six thousand, three hundred ninety-nine".