231012090 has 96 divisors (see below), whose sum is σ = 621977616. Its totient is φ = 59443200.

The previous prime is 231012083. The next prime is 231012091. The reversal of 231012090 is 90210132.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 230523489 + 488601 = 15183^2 + 699^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (231012091) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 575890 + ... + 576290.

Almost surely, 2^231012090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231012090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310988808).

231012090 is an abundant number, since it is smaller than the sum of its proper divisors (390965526).

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

231012090 is a wasteful number, since it uses less digits than its factorization.

231012090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 231012090 is about 15199.0818801663. The cubic root of 231012090 is about 613.5899482139.

It can be divided in two parts, 2310 and 12090, that added together give a square (14400 = 120²).

The spelling of 231012090 in words is "two hundred thirty-one million, twelve thousand, ninety".