167979391 has 2 divisors, whose sum is σ = 167979392. Its totient is φ = 167979390.

The previous prime is 167979379. The next prime is 167979451. The reversal of 167979391 is 193979761.

167979391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 167979391 - 2⁷ = 167979263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167979311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83989695 + 83989696.

It is an arithmetic number, because the mean of its divisors is an integer number (83989696).

Almost surely, 2^167979391 is an apocalyptic number.

167979391 is a deficient number, since it is larger than the sum of its proper divisors (1).

167979391 is an equidigital number, since it uses as much as digits as its factorization.

167979391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 642978, while the sum is 52.

The square root of 167979391 is about 12960.6863629979. The cubic root of 167979391 is about 551.7622713899.

The spelling of 167979391 in words is "one hundred sixty-seven million, nine hundred seventy-nine thousand, three hundred ninety-one".