231402757 has 2 divisors, whose sum is σ = 231402758. Its totient is φ = 231402756.

The previous prime is 231402751. The next prime is 231402781. The reversal of 231402757 is 757204132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226231681 + 5171076 = 15041^2 + 2274^2 .

It is a cyclic number.

It is not a de Polignac number, because 231402757 - 2¹⁹ = 230878469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231402751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115701378 + 115701379.

It is an arithmetic number, because the mean of its divisors is an integer number (115701379).

Almost surely, 2^231402757 is an apocalyptic number.

It is an amenable number.

231402757 is a deficient number, since it is larger than the sum of its proper divisors (1).

231402757 is an equidigital number, since it uses as much as digits as its factorization.

231402757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 231402757 is about 15211.9281157912. The cubic root of 231402757 is about 613.9356362485.

Adding to 231402757 its reverse (757204132), we get a palindrome (988606889).

The spelling of 231402757 in words is "two hundred thirty-one million, four hundred two thousand, seven hundred fifty-seven".