231061540 has 12 divisors (see below), whose sum is σ = 485229276. Its totient is φ = 92424608.

The previous prime is 231061499. The next prime is 231061549. The reversal of 231061540 is 45160132.

It can be written as a sum of positive squares in 2 ways, for example, as 111640356 + 119421184 = 10566^2 + 10928^2 .

It is not an unprimeable number, because it can be changed into a prime (231061549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5776519 + ... + 5776558.

It is an arithmetic number, because the mean of its divisors is an integer number (40435773).

Almost surely, 2^231061540 is an apocalyptic number.

231061540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231061540 is an abundant number, since it is smaller than the sum of its proper divisors (254167736).

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

231061540 is a wasteful number, since it uses less digits than its factorization.

231061540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11553086 (or 11553084 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 231061540 is about 15200.7085361177. The cubic root of 231061540 is about 613.6337263818.

The spelling of 231061540 in words is "two hundred thirty-one million, sixty-one thousand, five hundred forty".