167881121 has 4 divisors (see below), whose sum is σ = 167911044. Its totient is φ = 167851200.

The previous prime is 167881079. The next prime is 167881123. The reversal of 167881121 is 121188761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67881121 + 100000000 = 8239^2 + 10000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-167881121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (167881123) 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, 3740 + ... + 18701.

It is an arithmetic number, because the mean of its divisors is an integer number (41977761).

It is a Poulet number, since it divides 2^167881120-1.

Almost surely, 2^167881121 is an apocalyptic number.

167881121 is the 7481-st octagonal number.

It is an amenable number.

167881121 is a deficient number, since it is larger than the sum of its proper divisors (29923).

167881121 is an equidigital number, since it uses as much as digits as its factorization.

167881121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29922.

The product of its digits is 5376, while the sum is 35.

The square root of 167881121 is about 12956.8947282904. The cubic root of 167881121 is about 551.6546545071.

The spelling of 167881121 in words is "one hundred sixty-seven million, eight hundred eighty-one thousand, one hundred twenty-one".