31130219 has 4 divisors (see below), whose sum is σ = 31224600. Its totient is φ = 31035840.

The previous prime is 31130171. The next prime is 31130221. The reversal of 31130219 is 91203113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31130219 is a prime.

It is a super-2 number, since 2×31130219² = 1938181069975922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31130219.

It is not an unprimeable number, because it can be changed into a prime (31130279) 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, 46694 + ... + 47355.

It is an arithmetic number, because the mean of its divisors is an integer number (7806150).

Almost surely, 2^31130219 is an apocalyptic number.

31130219 is a deficient number, since it is larger than the sum of its proper divisors (94381).

31130219 is an equidigital number, since it uses as much as digits as its factorization.

31130219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94380.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 31130219 is about 5579.4461194638. The cubic root of 31130219 is about 314.5773082522.

The spelling of 31130219 in words is "thirty-one million, one hundred thirty thousand, two hundred nineteen".