231006140 has 24 divisors (see below), whose sum is σ = 487583712. Its totient is φ = 91931840.

The previous prime is 231006131. The next prime is 231006143. The reversal of 231006140 is 41600132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231006143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25376 + ... + 33255.

It is an arithmetic number, because the mean of its divisors is an integer number (20315988).

Almost surely, 2^231006140 is an apocalyptic number.

231006140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231006140 is an abundant number, since it is smaller than the sum of its proper divisors (256577572).

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

231006140 is a wasteful number, since it uses less digits than its factorization.

231006140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58837 (or 58835 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 231006140 is about 15198.8861433988. The cubic root of 231006140 is about 613.5846802478.

Adding to 231006140 its reverse (41600132), we get a palindrome (272606272).

The spelling of 231006140 in words is "two hundred thirty-one million, six thousand, one hundred forty".