158809691 has 4 divisors (see below), whose sum is σ = 158841072. Its totient is φ = 158778312.

The previous prime is 158809681. The next prime is 158809711. The reversal of 158809691 is 196908851.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158809691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158809681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6176 + ... + 18861.

It is an arithmetic number, because the mean of its divisors is an integer number (39710268).

Almost surely, 2^158809691 is an apocalyptic number.

158809691 is a deficient number, since it is larger than the sum of its proper divisors (31381).

158809691 is an equidigital number, since it uses as much as digits as its factorization.

158809691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31380.

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 158809691 is about 12601.9717108078. The cubic root of 158809691 is about 541.5339227958.

The spelling of 158809691 in words is "one hundred fifty-eight million, eight hundred nine thousand, six hundred ninety-one".