389158691 has 2 divisors, whose sum is σ = 389158692. Its totient is φ = 389158690.

The previous prime is 389158669. The next prime is 389158771. The reversal of 389158691 is 196851983.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (196851983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389158691 - 2¹⁰ = 389157667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (389158621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194579345 + 194579346.

It is an arithmetic number, because the mean of its divisors is an integer number (194579346).

Almost surely, 2^389158691 is an apocalyptic number.

389158691 is a deficient number, since it is larger than the sum of its proper divisors (1).

389158691 is an equidigital number, since it uses as much as digits as its factorization.

389158691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 389158691 is about 19727.1054896556. The cubic root of 389158691 is about 730.0886181278.

The spelling of 389158691 in words is "three hundred eighty-nine million, one hundred fifty-eight thousand, six hundred ninety-one".