167961281 has 4 divisors (see below), whose sum is σ = 168068052. Its totient is φ = 167854512.

The previous prime is 167961181. The next prime is 167961289. The reversal of 167961281 is 182169761.

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 35343025 + 132618256 = 5945^2 + 11516^2 .

It is a cyclic number.

It is not a de Polignac number, because 167961281 - 2¹⁸ = 167699137 is a prime.

It is a super-2 number, since 2×167961281² = 56421983830321922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (167961289) 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, 50990 + ... + 54183.

It is an arithmetic number, because the mean of its divisors is an integer number (42017013).

Almost surely, 2^167961281 is an apocalyptic number.

It is an amenable number.

167961281 is a deficient number, since it is larger than the sum of its proper divisors (106771).

167961281 is a wasteful number, since it uses less digits than its factorization.

167961281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106770.

The product of its digits is 36288, while the sum is 41.

The square root of 167961281 is about 12959.9876928954. The cubic root of 167961281 is about 551.7424420251.

The spelling of 167961281 in words is "one hundred sixty-seven million, nine hundred sixty-one thousand, two hundred eighty-one".