31322130 has 32 divisors (see below), whose sum is σ = 85912704. Its totient is φ = 7159296.

The previous prime is 31322129. The next prime is 31322149. The reversal of 31322130 is 3122313.

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

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 74367 + ... + 74786.

It is an arithmetic number, because the mean of its divisors is an integer number (2684772).

Almost surely, 2^31322130 is an apocalyptic number.

31322130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31322130 is an abundant number, since it is smaller than the sum of its proper divisors (54590574).

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

31322130 is a wasteful number, since it uses less digits than its factorization.

31322130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149170.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 31322130 is about 5596.6177285929. The cubic root of 31322130 is about 315.2224178722. Note that the first 3 decimals are identical.

Adding to 31322130 its reverse (3122313), we get a palindrome (34444443).

The spelling of 31322130 in words is "thirty-one million, three hundred twenty-two thousand, one hundred thirty".