158601691 has 2 divisors, whose sum is σ = 158601692. Its totient is φ = 158601690.

The previous prime is 158601689. The next prime is 158601727. The reversal of 158601691 is 196106851.

158601691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 158601691 - 2¹ = 158601689 is a prime.

Together with 158601689, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 158601691.

It is not a weakly prime, because it can be changed into another prime (158601671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79300845 + 79300846.

It is an arithmetic number, because the mean of its divisors is an integer number (79300846).

Almost surely, 2^158601691 is an apocalyptic number.

158601691 is a deficient number, since it is larger than the sum of its proper divisors (1).

158601691 is an equidigital number, since it uses as much as digits as its factorization.

158601691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 158601691 is about 12593.7163299798. The cubic root of 158601691 is about 541.2973959459.

The spelling of 158601691 in words is "one hundred fifty-eight million, six hundred one thousand, six hundred ninety-one".