231520422 has 16 divisors (see below), whose sum is σ = 529189632. Its totient is φ = 66148680.

The previous prime is 231520411. The next prime is 231520441. The reversal of 231520422 is 224025132.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 2756154 + ... + 2756237.

It is an arithmetic number, because the mean of its divisors is an integer number (33074352).

Almost surely, 2^231520422 is an apocalyptic number.

231520422 is an abundant number, since it is smaller than the sum of its proper divisors (297669210).

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

231520422 is a wasteful number, since it uses less digits than its factorization.

231520422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512403.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 231520422 is about 15215.7951484633. The cubic root of 231520422 is about 614.0396777862.

Adding to 231520422 its reverse (224025132), we get a palindrome (455545554).

The spelling of 231520422 in words is "two hundred thirty-one million, five hundred twenty thousand, four hundred twenty-two".