31000402242 has 64 divisors (see below), whose sum is σ = 72630230400. Its totient is φ = 9774120960.

The previous prime is 31000402229. The next prime is 31000402243. The reversal of 31000402242 is 24220400013.

It is a super-2 number, since 2×31000402242² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31000402243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 634098 + ... + 681234.

It is an arithmetic number, because the mean of its divisors is an integer number (1134847350).

Almost surely, 2^31000402242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31000402242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36315115200).

31000402242 is an abundant number, since it is smaller than the sum of its proper divisors (41629828158).

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

31000402242 is a wasteful number, since it uses less digits than its factorization.

31000402242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47808 (or 47802 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 31000402242 its reverse (24220400013), we get a palindrome (55220802255).

The spelling of 31000402242 in words is "thirty-one billion, four hundred two thousand, two hundred forty-two".