161847361 has 16 divisors (see below), whose sum is σ = 189547344. Its totient is φ = 136802304.

The previous prime is 161847331. The next prime is 161847391. The reversal of 161847361 is 163748161.

It is an interprime number because it is at equal distance from previous prime (161847331) and next prime (161847391).

It can be written as a sum of positive squares in 8 ways, for example, as 18326961 + 143520400 = 4281^2 + 11980^2 .

It is a cyclic number.

It is not a de Polignac number, because 161847361 - 2¹⁵ = 161814593 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161847361.

It is not an unprimeable number, because it can be changed into a prime (161847331) 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 15 ways as a sum of consecutive naturals, for example, 1720 + ... + 18073.

It is an arithmetic number, because the mean of its divisors is an integer number (11846709).

Almost surely, 2^161847361 is an apocalyptic number.

It is an amenable number.

161847361 is a deficient number, since it is larger than the sum of its proper divisors (27699983).

161847361 is a wasteful number, since it uses less digits than its factorization.

161847361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19860.

The product of its digits is 24192, while the sum is 37.

The square root of 161847361 is about 12721.9244220362. The cubic root of 161847361 is about 544.9649120299.

The spelling of 161847361 in words is "one hundred sixty-one million, eight hundred forty-seven thousand, three hundred sixty-one".