161144659 has 4 divisors (see below), whose sum is σ = 173540416. Its totient is φ = 148748904.

The previous prime is 161144617. The next prime is 161144663. The reversal of 161144659 is 956441161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 956441161 = 13 ⋅73572397.

It is a cyclic number.

It is not a de Polignac number, because 161144659 - 2⁷ = 161144531 is a prime.

It is a super-2 number, since 2×161144659² = 51935202248452562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161144609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6197859 + ... + 6197884.

It is an arithmetic number, because the mean of its divisors is an integer number (43385104).

Almost surely, 2^161144659 is an apocalyptic number.

161144659 is a deficient number, since it is larger than the sum of its proper divisors (12395757).

161144659 is a wasteful number, since it uses less digits than its factorization.

161144659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12395756.

The product of its digits is 25920, while the sum is 37.

The square root of 161144659 is about 12694.2766237387. The cubic root of 161144659 is about 544.1750659793.

The spelling of 161144659 in words is "one hundred sixty-one million, one hundred forty-four thousand, six hundred fifty-nine".