161219361 has 16 divisors (see below), whose sum is σ = 217728000. Its totient is φ = 106102608.

The previous prime is 161219327. The next prime is 161219363. The reversal of 161219361 is 163912161.

It is not a de Polignac number, because 161219361 - 2⁶ = 161219297 is a prime.

It is a super-2 number, since 2×161219361² = 51983364722496642, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 114540 + ... + 115938.

It is an arithmetic number, because the mean of its divisors is an integer number (13608000).

Almost surely, 2^161219361 is an apocalyptic number.

It is an amenable number.

161219361 is a deficient number, since it is larger than the sum of its proper divisors (56508639).

161219361 is a wasteful number, since it uses less digits than its factorization.

161219361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868.

The product of its digits is 1944, while the sum is 30.

The square root of 161219361 is about 12697.2186324407. The cubic root of 161219361 is about 544.2591409260.

The spelling of 161219361 in words is "one hundred sixty-one million, two hundred nineteen thousand, three hundred sixty-one".