167851261 has 4 divisors (see below), whose sum is σ = 168010524. Its totient is φ = 167692000.

The previous prime is 167851259. The next prime is 167851297. The reversal of 167851261 is 162158761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162158761 = 2309 ⋅70229.

It can be written as a sum of positive squares in 2 ways, for example, as 45306361 + 122544900 = 6731^2 + 11070^2 .

It is a cyclic number.

It is not a de Polignac number, because 167851261 - 2¹ = 167851259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 167851261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167851561) 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 3 ways as a sum of consecutive naturals, for example, 78040 + ... + 80161.

It is an arithmetic number, because the mean of its divisors is an integer number (42002631).

Almost surely, 2^167851261 is an apocalyptic number.

It is an amenable number.

167851261 is a deficient number, since it is larger than the sum of its proper divisors (159263).

167851261 is a wasteful number, since it uses less digits than its factorization.

167851261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159262.

The product of its digits is 20160, while the sum is 37.

The square root of 167851261 is about 12955.7423947839. The cubic root of 167851261 is about 551.6219460751.

The spelling of 167851261 in words is "one hundred sixty-seven million, eight hundred fifty-one thousand, two hundred sixty-one".