161219863 has 4 divisors (see below), whose sum is σ = 184251280. Its totient is φ = 138188448.

The previous prime is 161219837. The next prime is 161219899. The reversal of 161219863 is 368912161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161219863 - 2¹⁷ = 161088791 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 (161219363) 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, 11515698 + ... + 11515711.

It is an arithmetic number, because the mean of its divisors is an integer number (46062820).

Almost surely, 2^161219863 is an apocalyptic number.

161219863 is a deficient number, since it is larger than the sum of its proper divisors (23031417).

161219863 is an equidigital number, since it uses as much as digits as its factorization.

161219863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23031416.

The product of its digits is 15552, while the sum is 37.

The square root of 161219863 is about 12697.2384005342. The cubic root of 161219863 is about 544.2597058247.

The spelling of 161219863 in words is "one hundred sixty-one million, two hundred nineteen thousand, eight hundred sixty-three".