231510202397 has 2 divisors, whose sum is σ = 231510202398. Its totient is φ = 231510202396.

The previous prime is 231510202393. The next prime is 231510202409. The reversal of 231510202397 is 793202015132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171656090596 + 59854111801 = 414314^2 + 244651^2 .

It is a cyclic number.

It is not a de Polignac number, because 231510202397 - 2² = 231510202393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231510202393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115755101198 + 115755101199.

It is an arithmetic number, because the mean of its divisors is an integer number (115755101199).

Almost surely, 2^231510202397 is an apocalyptic number.

It is an amenable number.

231510202397 is a deficient number, since it is larger than the sum of its proper divisors (1).

231510202397 is an equidigital number, since it uses as much as digits as its factorization.

231510202397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The spelling of 231510202397 in words is "two hundred thirty-one billion, five hundred ten million, two hundred two thousand, three hundred ninety-seven".