158156819 has 2 divisors, whose sum is σ = 158156820. Its totient is φ = 158156818.

The previous prime is 158156777. The next prime is 158156821. The reversal of 158156819 is 918651851.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158156819 is a prime.

It is a super-2 number, since 2×158156819² = 50027158792397522, which contains 22 as substring.

Together with 158156821, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 158156819.

It is not a weakly prime, because it can be changed into another prime (158156879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79078409 + 79078410.

It is an arithmetic number, because the mean of its divisors is an integer number (79078410).

Almost surely, 2^158156819 is an apocalyptic number.

158156819 is a deficient number, since it is larger than the sum of its proper divisors (1).

158156819 is an equidigital number, since it uses as much as digits as its factorization.

158156819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 44.

The square root of 158156819 is about 12576.0414678070. The cubic root of 158156819 is about 540.7908154722.

The spelling of 158156819 in words is "one hundred fifty-eight million, one hundred fifty-six thousand, eight hundred nineteen".