158986391 has 2 divisors, whose sum is σ = 158986392. Its totient is φ = 158986390.

The previous prime is 158986369. The next prime is 158986403. The reversal of 158986391 is 193689851.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (193689851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158986391 - 2²² = 154792087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158986301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79493195 + 79493196.

It is an arithmetic number, because the mean of its divisors is an integer number (79493196).

Almost surely, 2^158986391 is an apocalyptic number.

158986391 is a deficient number, since it is larger than the sum of its proper divisors (1).

158986391 is an equidigital number, since it uses as much as digits as its factorization.

158986391 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 158986391 is about 12608.9805694196. The cubic root of 158986391 is about 541.7346947091.

The spelling of 158986391 in words is "one hundred fifty-eight million, nine hundred eighty-six thousand, three hundred ninety-one".