231561740 has 24 divisors (see below), whose sum is σ = 511874160. Its totient is φ = 87749568.

The previous prime is 231561731. The next prime is 231561761. The reversal of 231561740 is 47165132.

231561740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304307 + ... + 305066.

It is an arithmetic number, because the mean of its divisors is an integer number (21328090).

Almost surely, 2^231561740 is an apocalyptic number.

231561740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231561740 is an abundant number, since it is smaller than the sum of its proper divisors (280312420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231561740 is a wasteful number, since it uses less digits than its factorization.

231561740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609401 (or 609399 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 231561740 is about 15217.1528217338. The cubic root of 231561740 is about 614.0762035522.

The spelling of 231561740 in words is "two hundred thirty-one million, five hundred sixty-one thousand, seven hundred forty".