161162861 has 4 divisors (see below), whose sum is σ = 165518652. Its totient is φ = 156807072.

The previous prime is 161162857. The next prime is 161162867. The reversal of 161162861 is 168261161.

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 112232836 + 48930025 = 10594^2 + 6995^2 .

It is a cyclic number.

It is not a de Polignac number, because 161162861 - 2² = 161162857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161162867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2177840 + ... + 2177913.

It is an arithmetic number, because the mean of its divisors is an integer number (41379663).

Almost surely, 2^161162861 is an apocalyptic number.

It is an amenable number.

161162861 is a deficient number, since it is larger than the sum of its proper divisors (4355791).

161162861 is an equidigital number, since it uses as much as digits as its factorization.

161162861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4355790.

The product of its digits is 3456, while the sum is 32.

The square root of 161162861 is about 12694.9935407624. The cubic root of 161162861 is about 544.1955541992.

The spelling of 161162861 in words is "one hundred sixty-one million, one hundred sixty-two thousand, eight hundred sixty-one".