401945189 has 2 divisors, whose sum is σ = 401945190. Its totient is φ = 401945188.

The previous prime is 401945153. The next prime is 401945197. The reversal of 401945189 is 981549104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401321089 + 624100 = 20033^2 + 790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401945189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401945389) 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, 200972594 + 200972595.

It is an arithmetic number, because the mean of its divisors is an integer number (200972595).

Almost surely, 2^401945189 is an apocalyptic number.

It is an amenable number.

401945189 is a deficient number, since it is larger than the sum of its proper divisors (1).

401945189 is an equidigital number, since it uses as much as digits as its factorization.

401945189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 401945189 is about 20048.5707470632. The cubic root of 401945189 is about 737.9987251589.

The spelling of 401945189 in words is "four hundred one million, nine hundred forty-five thousand, one hundred eighty-nine".