231398737 has 2 divisors, whose sum is σ = 231398738. Its totient is φ = 231398736.

The previous prime is 231398731. The next prime is 231398749. The reversal of 231398737 is 737893132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172554496 + 58844241 = 13136^2 + 7671^2 .

It is a cyclic number.

It is not a de Polignac number, because 231398737 - 2³ = 231398729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231398693 and 231398702.

It is not a weakly prime, because it can be changed into another prime (231398731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115699368 + 115699369.

It is an arithmetic number, because the mean of its divisors is an integer number (115699369).

Almost surely, 2^231398737 is an apocalyptic number.

It is an amenable number.

231398737 is a deficient number, since it is larger than the sum of its proper divisors (1).

231398737 is an equidigital number, since it uses as much as digits as its factorization.

231398737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 43.

The square root of 231398737 is about 15211.7959820660. The cubic root of 231398737 is about 613.9320810682.

The spelling of 231398737 in words is "two hundred thirty-one million, three hundred ninety-eight thousand, seven hundred thirty-seven".