31420189 has 2 divisors, whose sum is σ = 31420190. Its totient is φ = 31420188.

The previous prime is 31420183. The next prime is 31420217. The reversal of 31420189 is 98102413.

It is a happy number.

It is an a-pointer prime, because the next prime (31420217) can be obtained adding 31420189 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29268100 + 2152089 = 5410^2 + 1467^2 .

It is a cyclic number.

It is not a de Polignac number, because 31420189 - 2⁵ = 31420157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31420183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710094 + 15710095.

It is an arithmetic number, because the mean of its divisors is an integer number (15710095).

Almost surely, 2^31420189 is an apocalyptic number.

It is an amenable number.

31420189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31420189 is an equidigital number, since it uses as much as digits as its factorization.

31420189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 31420189 is about 5605.3714417512. The cubic root of 31420189 is about 315.5510267971.

It can be divided in two parts, 314 and 20189, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 31420189 in words is "thirty-one million, four hundred twenty thousand, one hundred eighty-nine".