158369891 has 2 divisors, whose sum is σ = 158369892. Its totient is φ = 158369890.

The previous prime is 158369833. The next prime is 158369963. The reversal of 158369891 is 198963851.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (198963851) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158369891 is a prime.

It is not a weakly prime, because it can be changed into another prime (158369821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79184945 + 79184946.

It is an arithmetic number, because the mean of its divisors is an integer number (79184946).

Almost surely, 2^158369891 is an apocalyptic number.

158369891 is a deficient number, since it is larger than the sum of its proper divisors (1).

158369891 is an equidigital number, since it uses as much as digits as its factorization.

158369891 is an odious number, because the sum of its binary digits is odd.

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

The square root of 158369891 is about 12584.5099626485. The cubic root of 158369891 is about 541.0335611945.

The spelling of 158369891 in words is "one hundred fifty-eight million, three hundred sixty-nine thousand, eight hundred ninety-one".