31840189 has 2 divisors, whose sum is σ = 31840190. Its totient is φ = 31840188.

The previous prime is 31840187. The next prime is 31840217. The reversal of 31840189 is 98104813.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28836900 + 3003289 = 5370^2 + 1733^2 .

It is a cyclic number.

It is not a de Polignac number, because 31840189 - 2¹ = 31840187 is a prime.

Together with 31840187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31840187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15920094 + 15920095.

It is an arithmetic number, because the mean of its divisors is an integer number (15920095).

Almost surely, 2^31840189 is an apocalyptic number.

It is an amenable number.

31840189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31840189 is an equidigital number, since it uses as much as digits as its factorization.

31840189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 31840189 is about 5642.7111391600. The cubic root of 31840189 is about 316.9508194924.

The spelling of 31840189 in words is "thirty-one million, eight hundred forty thousand, one hundred eighty-nine".