167898989 has 4 divisors (see below), whose sum is σ = 167942556. Its totient is φ = 167855424.

The previous prime is 167898971. The next prime is 167899001. The reversal of 167898989 is 989898761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989898761 = 73 ⋅13560257.

It can be written as a sum of positive squares in 2 ways, for example, as 110775625 + 57123364 = 10525^2 + 7558^2 .

It is a cyclic number.

It is not a de Polignac number, because 167898989 - 2¹² = 167894893 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167898959) 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, 15374 + ... + 23919.

It is an arithmetic number, because the mean of its divisors is an integer number (41985639).

Almost surely, 2^167898989 is an apocalyptic number.

It is an amenable number.

167898989 is a deficient number, since it is larger than the sum of its proper divisors (43567).

167898989 is an equidigital number, since it uses as much as digits as its factorization.

167898989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43566.

The product of its digits is 15676416, while the sum is 65.

The square root of 167898989 is about 12957.5842270077. The cubic root of 167898989 is about 551.6742251327.

The spelling of 167898989 in words is "one hundred sixty-seven million, eight hundred ninety-eight thousand, nine hundred eighty-nine".