161459865 has 32 divisors (see below), whose sum is σ = 328047360. Its totient is φ = 73809792.

The previous prime is 161459833. The next prime is 161459869. The reversal of 161459865 is 568954161.

It is not a de Polignac number, because 161459865 - 2⁵ = 161459833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161459865.

It is not an unprimeable number, because it can be changed into a prime (161459869) 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 31 ways as a sum of consecutive naturals, for example, 84484 + ... + 86373.

It is an arithmetic number, because the mean of its divisors is an integer number (10251480).

Almost surely, 2^161459865 is an apocalyptic number.

161459865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161459865 is an abundant number, since it is smaller than the sum of its proper divisors (166587495).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161459865 is a wasteful number, since it uses less digits than its factorization.

161459865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170878 (or 170872 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 161459865 is about 12706.6858385655. The cubic root of 161459865 is about 544.5296449645.

The spelling of 161459865 in words is "one hundred sixty-one million, four hundred fifty-nine thousand, eight hundred sixty-five".