158178091 has 2 divisors, whose sum is σ = 158178092. Its totient is φ = 158178090.

The previous prime is 158178073. The next prime is 158178113. The reversal of 158178091 is 190871851.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 158178091 - 2⁷ = 158177963 is a prime.

It is equal to p_8878009 and since 158178091 and 8878009 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (158178011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79089045 + 79089046.

It is an arithmetic number, because the mean of its divisors is an integer number (79089046).

Almost surely, 2^158178091 is an apocalyptic number.

158178091 is a deficient number, since it is larger than the sum of its proper divisors (1).

158178091 is an equidigital number, since it uses as much as digits as its factorization.

158178091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 40.

The square root of 158178091 is about 12576.8871744959. The cubic root of 158178091 is about 540.8150597351.

The spelling of 158178091 in words is "one hundred fifty-eight million, one hundred seventy-eight thousand, ninety-one".