231426397 has 2 divisors, whose sum is σ = 231426398. Its totient is φ = 231426396.

The previous prime is 231426361. The next prime is 231426407. The reversal of 231426397 is 793624132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230614596 + 811801 = 15186^2 + 901^2 .

It is a cyclic number.

It is not a de Polignac number, because 231426397 - 2⁷ = 231426269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231426337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115713198 + 115713199.

It is an arithmetic number, because the mean of its divisors is an integer number (115713199).

Almost surely, 2^231426397 is an apocalyptic number.

It is an amenable number.

231426397 is a deficient number, since it is larger than the sum of its proper divisors (1).

231426397 is an equidigital number, since it uses as much as digits as its factorization.

231426397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 37.

The square root of 231426397 is about 15212.7051177626. The cubic root of 231426397 is about 613.9565419980.

The spelling of 231426397 in words is "two hundred thirty-one million, four hundred twenty-six thousand, three hundred ninety-seven".