31111220132 has 12 divisors (see below), whose sum is σ = 54450531660. Its totient is φ = 15553925376.

The previous prime is 31111220131. The next prime is 31111220167. The reversal of 31111220132 is 23102211113.

It can be written as a sum of positive squares in 2 ways, for example, as 24069660736 + 7041559396 = 155144^2 + 83914^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31111220132.

It is not an unprimeable number, because it can be changed into a prime (31111220131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379157 + ... + 453852.

It is an arithmetic number, because the mean of its divisors is an integer number (4537544305).

Almost surely, 2^31111220132 is an apocalyptic number.

It is an amenable number.

31111220132 is a deficient number, since it is larger than the sum of its proper divisors (23339311528).

31111220132 is a wasteful number, since it uses less digits than its factorization.

31111220132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842350 (or 842348 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31111220132 its reverse (23102211113), we get a palindrome (54213431245).

The spelling of 31111220132 in words is "thirty-one billion, one hundred eleven million, two hundred twenty thousand, one hundred thirty-two".