161967 has 8 divisors (see below), whose sum is σ = 232624. Its totient is φ = 99648.

The previous prime is 161957. The next prime is 161969. The reversal of 161967 is 769161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161967 - 2⁷ = 161839 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2038 + ... + 2115.

It is an arithmetic number, because the mean of its divisors is an integer number (29078).

2¹⁶¹⁹⁶⁷ is an apocalyptic number.

161967 is a deficient number, since it is larger than the sum of its proper divisors (70657).

161967 is a wasteful number, since it uses less digits than its factorization.

161967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4169.

The product of its digits is 2268, while the sum is 30.

The square root of 161967 is about 402.4512392825. The cubic root of 161967 is about 54.5099159916.

It can be divided in two parts, 161 and 967, that added together give a triangular number (1128 = T₄₇).

The spelling of 161967 in words is "one hundred sixty-one thousand, nine hundred sixty-seven".