31230131 has 4 divisors (see below), whose sum is σ = 31670064. Its totient is φ = 30790200.

The previous prime is 31230079. The next prime is 31230163. The reversal of 31230131 is 13103213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13103213 = 1733 ⋅7561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31230131 is a prime.

It is a super-2 number, since 2×31230131² = 1950642164554322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31230191) 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 3 ways as a sum of consecutive naturals, for example, 219860 + ... + 220001.

It is an arithmetic number, because the mean of its divisors is an integer number (7917516).

Almost surely, 2^31230131 is an apocalyptic number.

31230131 is a deficient number, since it is larger than the sum of its proper divisors (439933).

31230131 is an equidigital number, since it uses as much as digits as its factorization.

31230131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439932.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 31230131 is about 5588.3925237943. The cubic root of 31230131 is about 314.9134926639.

Adding to 31230131 its reverse (13103213), we get a palindrome (44333344).

The spelling of 31230131 in words is "thirty-one million, two hundred thirty thousand, one hundred thirty-one".