191379589 has 2 divisors, whose sum is σ = 191379590. Its totient is φ = 191379588.

The previous prime is 191379581. The next prime is 191379611. The reversal of 191379589 is 985973191.

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., 185776900 + 5602689 = 13630^2 + 2367^2 .

It is a cyclic number.

It is not a de Polignac number, because 191379589 - 2³ = 191379581 is a prime.

It is a super-2 number, since 2×191379589² = 73252294171617842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191379581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95689794 + 95689795.

It is an arithmetic number, because the mean of its divisors is an integer number (95689795).

Almost surely, 2^191379589 is an apocalyptic number.

It is an amenable number.

191379589 is a deficient number, since it is larger than the sum of its proper divisors (1).

191379589 is an equidigital number, since it uses as much as digits as its factorization.

191379589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 52.

The square root of 191379589 is about 13834.0011927136. The cubic root of 191379589 is about 576.2777774217.

The spelling of 191379589 in words is "one hundred ninety-one million, three hundred seventy-nine thousand, five hundred eighty-nine".