231561825 has 24 divisors (see below), whose sum is σ = 417654816. Its totient is φ = 112272000.

The previous prime is 231561817. The next prime is 231561829. The reversal of 231561825 is 528165132.

It is not a de Polignac number, because 231561825 - 2³ = 231561817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (231561829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139516 + ... + 141165.

It is an arithmetic number, because the mean of its divisors is an integer number (17402284).

Almost surely, 2^231561825 is an apocalyptic number.

231561825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231561825 is a deficient number, since it is larger than the sum of its proper divisors (186092991).

231561825 is a wasteful number, since it uses less digits than its factorization.

231561825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280705 (or 280700 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 231561825 is about 15217.1556146344. The cubic root of 231561825 is about 614.0762786891.

The spelling of 231561825 in words is "two hundred thirty-one million, five hundred sixty-one thousand, eight hundred twenty-five".