31442231236 has 24 divisors (see below), whose sum is σ = 61832885184. Its totient is φ = 13880850720.

The previous prime is 31442231189. The next prime is 31442231237. The reversal of 31442231236 is 63213224413.

It is a happy number.

It is a super-2 number, since 2×31442231236² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31442231198 and 31442231207.

It is not an unprimeable number, because it can be changed into a prime (31442231237) 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, 13143550 + ... + 13145941.

It is an arithmetic number, because the mean of its divisors is an integer number (2576370216).

Almost surely, 2^31442231236 is an apocalyptic number.

It is an amenable number.

31442231236 is a deficient number, since it is larger than the sum of its proper divisors (30390653948).

31442231236 is a wasteful number, since it uses less digits than its factorization.

31442231236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26289531 (or 26289529 counting only the distinct ones).

The product of its digits is 20736, while the sum is 31.

Adding to 31442231236 its reverse (63213224413), we get a palindrome (94655455649).

The spelling of 31442231236 in words is "thirty-one billion, four hundred forty-two million, two hundred thirty-one thousand, two hundred thirty-six".