167561 has 4 divisors (see below), whose sum is σ = 176400. Its totient is φ = 158724.

The previous prime is 167543. The next prime is 167593. The reversal of 167561 is 165761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165761 = 23 ⋅7207.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-167561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 167561.

It is not an unprimeable number, because it can be changed into a prime (167521) 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, 4391 + ... + 4428.

It is an arithmetic number, because the mean of its divisors is an integer number (44100).

2¹⁶⁷⁵⁶¹ is an apocalyptic number.

It is an amenable number.

167561 is a deficient number, since it is larger than the sum of its proper divisors (8839).

167561 is an equidigital number, since it uses as much as digits as its factorization.

167561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8838.

The product of its digits is 1260, while the sum is 26.

The square root of 167561 is about 409.3421551710. The cubic root of 167561 is about 55.1303793922.

The spelling of 167561 in words is "one hundred sixty-seven thousand, five hundred sixty-one".