31111130442 has 128 divisors (see below), whose sum is σ = 75607603200. Its totient is φ = 8336756736.

The previous prime is 31111130399. The next prime is 31111130459. The reversal of 31111130442 is 24403111113.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50422918 + ... + 50423534.

It is an arithmetic number, because the mean of its divisors is an integer number (590684400).

Almost surely, 2^31111130442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31111130442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37803801600).

31111130442 is an abundant number, since it is smaller than the sum of its proper divisors (44496472758).

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

31111130442 is a wasteful number, since it uses less digits than its factorization.

31111130442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 31111130442 its reverse (24403111113), we get a palindrome (55514241555).

The spelling of 31111130442 in words is "thirty-one billion, one hundred eleven million, one hundred thirty thousand, four hundred forty-two".