158971987 has 2 divisors, whose sum is σ = 158971988. Its totient is φ = 158971986.

The previous prime is 158971979. The next prime is 158971991. The reversal of 158971987 is 789179851.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 158971987 - 2³ = 158971979 is a prime.

It is not a weakly prime, because it can be changed into another prime (158971487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79485993 + 79485994.

It is an arithmetic number, because the mean of its divisors is an integer number (79485994).

Almost surely, 2^158971987 is an apocalyptic number.

158971987 is a deficient number, since it is larger than the sum of its proper divisors (1).

158971987 is an equidigital number, since it uses as much as digits as its factorization.

158971987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 55.

The square root of 158971987 is about 12608.4093762853. The cubic root of 158971987 is about 541.7183340169.

The spelling of 158971987 in words is "one hundred fifty-eight million, nine hundred seventy-one thousand, nine hundred eighty-seven".