158685971 has 2 divisors, whose sum is σ = 158685972. Its totient is φ = 158685970.

The previous prime is 158685913. The next prime is 158685977. The reversal of 158685971 is 179586851.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 158685971 - 2⁶ = 158685907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (158685977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79342985 + 79342986.

It is an arithmetic number, because the mean of its divisors is an integer number (79342986).

Almost surely, 2^158685971 is an apocalyptic number.

158685971 is a deficient number, since it is larger than the sum of its proper divisors (1).

158685971 is an equidigital number, since it uses as much as digits as its factorization.

158685971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 50.

The square root of 158685971 is about 12597.0619987361. The cubic root of 158685971 is about 541.3932597117.

The spelling of 158685971 in words is "one hundred fifty-eight million, six hundred eighty-five thousand, nine hundred seventy-one".