31830193 has 4 divisors (see below), whose sum is σ = 32139328. Its totient is φ = 31521060.

The previous prime is 31830181. The next prime is 31830199. The reversal of 31830193 is 39103813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31830193 is a prime.

It is a super-2 number, since 2×31830193² = 2026322372834498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31830199) 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, 154413 + ... + 154618.

It is an arithmetic number, because the mean of its divisors is an integer number (8034832).

Almost surely, 2^31830193 is an apocalyptic number.

It is an amenable number.

31830193 is a deficient number, since it is larger than the sum of its proper divisors (309135).

31830193 is a wasteful number, since it uses less digits than its factorization.

31830193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309134.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 31830193 is about 5641.8253251940. The cubic root of 31830193 is about 316.9176478719.

It can be divided in two parts, 31830 and 193, that added together give a palindrome (32023).

The spelling of 31830193 in words is "thirty-one million, eight hundred thirty thousand, one hundred ninety-three".