161679149 has 4 divisors (see below), whose sum is σ = 161767164. Its totient is φ = 161591136.

The previous prime is 161679143. The next prime is 161679179. The reversal of 161679149 is 941976161.

It is a happy number.

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 33582025 + 128097124 = 5795^2 + 11318^2 .

It is a cyclic number.

It is not a de Polignac number, because 161679149 - 2⁸ = 161678893 is a prime.

It is a super-2 number, since 2×161679149² = 52280294442728402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161679143) 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, 41192 + ... + 44945.

It is an arithmetic number, because the mean of its divisors is an integer number (40441791).

Almost surely, 2^161679149 is an apocalyptic number.

It is an amenable number.

161679149 is a deficient number, since it is larger than the sum of its proper divisors (88015).

161679149 is an equidigital number, since it uses as much as digits as its factorization.

161679149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88014.

The product of its digits is 81648, while the sum is 44.

The square root of 161679149 is about 12715.3115966539. The cubic root of 161679149 is about 544.7760480416.

The spelling of 161679149 in words is "one hundred sixty-one million, six hundred seventy-nine thousand, one hundred forty-nine".