158211971 has 2 divisors, whose sum is σ = 158211972. Its totient is φ = 158211970.

The previous prime is 158211967. The next prime is 158212001. The reversal of 158211971 is 179112851.

It is a weak prime.

It is an emirp because it is prime and its reverse (179112851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158211971 - 2² = 158211967 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (158211931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79105985 + 79105986.

It is an arithmetic number, because the mean of its divisors is an integer number (79105986).

Almost surely, 2^158211971 is an apocalyptic number.

158211971 is a deficient number, since it is larger than the sum of its proper divisors (1).

158211971 is an equidigital number, since it uses as much as digits as its factorization.

158211971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 35.

The square root of 158211971 is about 12578.2340175400. The cubic root of 158211971 is about 540.8536691828.

The spelling of 158211971 in words is "one hundred fifty-eight million, two hundred eleven thousand, nine hundred seventy-one".