31071042 has 48 divisors (see below), whose sum is σ = 72408960. Its totient is φ = 9598176.

The previous prime is 31071041. The next prime is 31071059. The reversal of 31071042 is 24017013.

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 (31071041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15108 + ... + 17040.

It is an arithmetic number, because the mean of its divisors is an integer number (1508520).

Almost surely, 2^31071042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31071042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36204480).

31071042 is an abundant number, since it is smaller than the sum of its proper divisors (41337918).

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

31071042 is a wasteful number, since it uses less digits than its factorization.

31071042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 31071042 is about 5574.1404718575. The cubic root of 31071042 is about 314.3778498662.

Adding to 31071042 its reverse (24017013), we get a palindrome (55088055).

The spelling of 31071042 in words is "thirty-one million, seventy-one thousand, forty-two".