231493291 has 2 divisors, whose sum is σ = 231493292. Its totient is φ = 231493290.

The previous prime is 231493277. The next prime is 231493303. The reversal of 231493291 is 192394132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231493291 - 2⁵ = 231493259 is a prime.

It is not a weakly prime, because it can be changed into another prime (231493261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115746645 + 115746646.

It is an arithmetic number, because the mean of its divisors is an integer number (115746646).

Almost surely, 2^231493291 is an apocalyptic number.

231493291 is a deficient number, since it is larger than the sum of its proper divisors (1).

231493291 is an equidigital number, since it uses as much as digits as its factorization.

231493291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 231493291 is about 15214.9035816860. The cubic root of 231493291 is about 614.0156911890.

The spelling of 231493291 in words is "two hundred thirty-one million, four hundred ninety-three thousand, two hundred ninety-one".