161848381 has 6 divisors (see below), whose sum is σ = 171929210. Its totient is φ = 152327616.

The previous prime is 161848367. The next prime is 161848411. The reversal of 161848381 is 183848161.

It can be written as a sum of positive squares in 3 ways, for example, as 18567481 + 143280900 = 4309^2 + 11970^2 .

It is not a de Polignac number, because 161848381 - 2¹⁵ = 161815613 is a prime.

It is a super-2 number, since 2×161848381² = 52389796864642322, 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 (161848301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 279726 + ... + 280303.

Almost surely, 2^161848381 is an apocalyptic number.

It is an amenable number.

161848381 is a deficient number, since it is larger than the sum of its proper divisors (10080829).

161848381 is an equidigital number, since it uses as much as digits as its factorization.

161848381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560063 (or 560046 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 161848381 is about 12721.9645102476. The cubic root of 161848381 is about 544.9660568597.

The spelling of 161848381 in words is "one hundred sixty-one million, eight hundred forty-eight thousand, three hundred eighty-one".