431780189 has 2 divisors, whose sum is σ = 431780190. Its totient is φ = 431780188.

The previous prime is 431780137. The next prime is 431780191. The reversal of 431780189 is 981087134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421604089 + 10176100 = 20533^2 + 3190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431780189 is a prime.

It is a super-2 number, since 2×431780189² = 372868263225751442, which contains 22 as substring.

Together with 431780191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431740189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215890094 + 215890095.

It is an arithmetic number, because the mean of its divisors is an integer number (215890095).

Almost surely, 2^431780189 is an apocalyptic number.

It is an amenable number.

431780189 is a deficient number, since it is larger than the sum of its proper divisors (1).

431780189 is an equidigital number, since it uses as much as digits as its factorization.

431780189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 431780189 is about 20779.3211871803. The cubic root of 431780189 is about 755.8243931355.

The spelling of 431780189 in words is "four hundred thirty-one million, seven hundred eighty thousand, one hundred eighty-nine".