231376891 has 2 divisors, whose sum is σ = 231376892. Its totient is φ = 231376890.

The previous prime is 231376861. The next prime is 231376909. The reversal of 231376891 is 198673132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231376891 - 2⁷ = 231376763 is a prime.

It is not a weakly prime, because it can be changed into another prime (231376841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115688445 + 115688446.

It is an arithmetic number, because the mean of its divisors is an integer number (115688446).

Almost surely, 2^231376891 is an apocalyptic number.

231376891 is a deficient number, since it is larger than the sum of its proper divisors (1).

231376891 is an equidigital number, since it uses as much as digits as its factorization.

231376891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 231376891 is about 15211.0779039488. The cubic root of 231376891 is about 613.9127603314.

The spelling of 231376891 in words is "two hundred thirty-one million, three hundred seventy-six thousand, eight hundred ninety-one".