231561793 has 2 divisors, whose sum is σ = 231561794. Its totient is φ = 231561792.

The previous prime is 231561761. The next prime is 231561817. The reversal of 231561793 is 397165132.

231561793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182169009 + 49392784 = 13497^2 + 7028^2 .

It is a cyclic number.

It is not a de Polignac number, because 231561793 - 2⁵ = 231561761 is a prime.

It is not a weakly prime, because it can be changed into another prime (231561893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115780896 + 115780897.

It is an arithmetic number, because the mean of its divisors is an integer number (115780897).

Almost surely, 2^231561793 is an apocalyptic number.

It is an amenable number.

231561793 is a deficient number, since it is larger than the sum of its proper divisors (1).

231561793 is an equidigital number, since it uses as much as digits as its factorization.

231561793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 37.

The square root of 231561793 is about 15217.1545631895. The cubic root of 231561793 is about 614.0762504023.

The spelling of 231561793 in words is "two hundred thirty-one million, five hundred sixty-one thousand, seven hundred ninety-three".