31793189 has 2 divisors, whose sum is σ = 31793190. Its totient is φ = 31793188.

The previous prime is 31793159. The next prime is 31793191. The reversal of 31793189 is 98139713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31730689 + 62500 = 5633^2 + 250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31793189 is a prime.

Together with 31793191, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1961798 and since 31793189 and 1961798 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31793159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15896594 + 15896595.

It is an arithmetic number, because the mean of its divisors is an integer number (15896595).

Almost surely, 2^31793189 is an apocalyptic number.

It is an amenable number.

31793189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31793189 is an equidigital number, since it uses as much as digits as its factorization.

31793189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 31793189 is about 5638.5449364176. The cubic root of 31793189 is about 316.7947900133.

The spelling of 31793189 in words is "thirty-one million, seven hundred ninety-three thousand, one hundred eighty-nine".