231622540 has 24 divisors (see below), whose sum is σ = 512008560. Its totient is φ = 87772608.

The previous prime is 231622529. The next prime is 231622543. The reversal of 231622540 is 45226132.

It is not an unprimeable number, because it can be changed into a prime (231622543) 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, 304387 + ... + 305146.

It is an arithmetic number, because the mean of its divisors is an integer number (21333690).

Almost surely, 2^231622540 is an apocalyptic number.

231622540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231622540 is an abundant number, since it is smaller than the sum of its proper divisors (280386020).

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

231622540 is a wasteful number, since it uses less digits than its factorization.

231622540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609561 (or 609559 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 231622540 is about 15219.1504362103. The cubic root of 231622540 is about 614.1299438145.

Adding to 231622540 its reverse (45226132), we get a palindrome (276848672).

The spelling of 231622540 in words is "two hundred thirty-one million, six hundred twenty-two thousand, five hundred forty".