31244130 has 80 divisors (see below), whose sum is σ = 88993080. Its totient is φ = 7838208.

The previous prime is 31244119. The next prime is 31244141. The reversal of 31244130 is 3144213.

It is an interprime number because it is at equal distance from previous prime (31244119) and next prime (31244141).

It can be written as a sum of positive squares in 4 ways, for example, as 21150801 + 10093329 = 4599^2 + 3177^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12636 + ... + 14904.

Almost surely, 2^31244130 is an apocalyptic number.

31244130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31244130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44496540).

31244130 is an abundant number, since it is smaller than the sum of its proper divisors (57748950).

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

31244130 is a wasteful number, since it uses less digits than its factorization.

31244130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305 (or 2296 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31244130 is about 5589.6448903307. The cubic root of 31244130 is about 314.9605392746.

Adding to 31244130 its reverse (3144213), we get a palindrome (34388343).

The spelling of 31244130 in words is "thirty-one million, two hundred forty-four thousand, one hundred thirty".