169479981 has 36 divisors (see below), whose sum is σ = 283279360. Its totient is φ = 97297200.

The previous prime is 169479971. The next prime is 169479991. The reversal of 169479981 is 189974961.

169479981 is a `hidden beast` number, since 169 + 479 + 9 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (169479971) and next prime (169479991).

It is not a de Polignac number, because 169479981 - 2⁵ = 169479949 is a prime.

It is a super-2 number, since 2×169479981² = 57446927919520722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169479971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16596 + ... + 24786.

Almost surely, 2^169479981 is an apocalyptic number.

169479981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

169479981 is a deficient number, since it is larger than the sum of its proper divisors (113799379).

169479981 is a wasteful number, since it uses less digits than its factorization.

169479981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8238 (or 8224 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 169479981 is about 13018.4477185262. The cubic root of 169479981 is about 553.4004002110.

The spelling of 169479981 in words is "one hundred sixty-nine million, four hundred seventy-nine thousand, nine hundred eighty-one".