31000242 has 48 divisors (see below), whose sum is σ = 77680512. Its totient is φ = 8174880.

The previous prime is 31000241. The next prime is 31000243. The reversal of 31000242 is 24200013.

It is an interprime number because it is at equal distance from previous prime (31000241) and next prime (31000243).

It is a super-2 number, since 2×31000242² = 1922030008117128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31000241) 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, 234 + ... + 7877.

It is an arithmetic number, because the mean of its divisors is an integer number (1618344).

Almost surely, 2^31000242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31000242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38840256).

31000242 is an abundant number, since it is smaller than the sum of its proper divisors (46680270).

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

31000242 is a wasteful number, since it uses less digits than its factorization.

31000242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8143 (or 8136 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 31000242 is about 5567.7860950292. The cubic root of 31000242 is about 314.1388826715.

Adding to 31000242 its reverse (24200013), we get a palindrome (55200255).

The spelling of 31000242 in words is "thirty-one million, two hundred forty-two", and thus it is an aban number.