31100130 has 96 divisors (see below), whose sum is σ = 85183488. Its totient is φ = 7862400.

The previous prime is 31100101. The next prime is 31100149. The reversal of 31100130 is 3100113.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 198012 + ... + 198168.

It is an arithmetic number, because the mean of its divisors is an integer number (887328).

Almost surely, 2^31100130 is an apocalyptic number.

31100130 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 31100130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42591744).

31100130 is an abundant number, since it is smaller than the sum of its proper divisors (54083358).

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

31100130 is a wasteful number, since it uses less digits than its factorization.

31100130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 9.

The square root of 31100130 is about 5576.7490529878. The cubic root of 31100130 is about 314.4759237224.

Adding to 31100130 its reverse (3100113), we get a palindrome (34200243).

The spelling of 31100130 in words is "thirty-one million, one hundred thousand, one hundred thirty".