167381491 has 4 divisors (see below), whose sum is σ = 168945912. Its totient is φ = 165817072.

The previous prime is 167381471. The next prime is 167381503. The reversal of 167381491 is 194183761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194183761 = 12157 ⋅15973.

It is a cyclic number.

It is not a de Polignac number, because 167381491 - 2⁹ = 167380979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (167381411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782050 + ... + 782263.

It is an arithmetic number, because the mean of its divisors is an integer number (42236478).

Almost surely, 2^167381491 is an apocalyptic number.

167381491 is a deficient number, since it is larger than the sum of its proper divisors (1564421).

167381491 is a wasteful number, since it uses less digits than its factorization.

167381491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564420.

The product of its digits is 36288, while the sum is 40.

The square root of 167381491 is about 12937.5998933342. The cubic root of 167381491 is about 551.1068520041.

The spelling of 167381491 in words is "one hundred sixty-seven million, three hundred eighty-one thousand, four hundred ninety-one".