167390991 has 12 divisors (see below), whose sum is σ = 245396632. Its totient is φ = 109928016.

The previous prime is 167390989. The next prime is 167391001. The reversal of 167390991 is 199093761.

It is not a de Polignac number, because 167390991 - 2¹ = 167390989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167390911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138196 + ... + 139401.

Almost surely, 2^167390991 is an apocalyptic number.

167390991 is a deficient number, since it is larger than the sum of its proper divisors (78005641).

167390991 is a wasteful number, since it uses less digits than its factorization.

167390991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277670 (or 277667 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 45.

The square root of 167390991 is about 12937.9670350484. The cubic root of 167390991 is about 551.1172781192.

The spelling of 167390991 in words is "one hundred sixty-seven million, three hundred ninety thousand, nine hundred ninety-one".