31601130 has 128 divisors (see below), whose sum is σ = 90326016. Its totient is φ = 6988800.

The previous prime is 31601099. The next prime is 31601137. The reversal of 31601130 is 3110613.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31601137) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 241165 + ... + 241295.

It is an arithmetic number, because the mean of its divisors is an integer number (705672).

Almost surely, 2^31601130 is an apocalyptic number.

31601130 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 31601130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45163008).

31601130 is an abundant number, since it is smaller than the sum of its proper divisors (58724886).

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

31601130 is a wasteful number, since it uses less digits than its factorization.

31601130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 31601130 is about 5621.4882371130. The cubic root of 31601130 is about 316.1555942076.

Adding to 31601130 its reverse (3110613), we get a palindrome (34711743).

The spelling of 31601130 in words is "thirty-one million, six hundred one thousand, one hundred thirty".