31222131232 has 12 divisors (see below), whose sum is σ = 61468570926. Its totient is φ = 15611065600.

The previous prime is 31222131221. The next prime is 31222131289. The reversal of 31222131232 is 23213122213.

It can be written as a sum of positive squares in only one way, i.e., 30794634256 + 427496976 = 175484^2 + 20676^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487845769 + ... + 487845832.

Almost surely, 2^31222131232 is an apocalyptic number.

31222131232 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31222131232 is a deficient number, since it is larger than the sum of its proper divisors (30246439694).

31222131232 is an equidigital number, since it uses as much as digits as its factorization.

31222131232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975691611 (or 975691603 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

Adding to 31222131232 its reverse (23213122213), we get a palindrome (54435253445).

The spelling of 31222131232 in words is "thirty-one billion, two hundred twenty-two million, one hundred thirty-one thousand, two hundred thirty-two".