19145161 has 4 divisors (see below), whose sum is σ = 21880192. Its totient is φ = 16410132.

The previous prime is 19145149. The next prime is 19145167. The reversal of 19145161 is 16154191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16154191 = 421 ⋅38371.

It is a cyclic number.

It is not a de Polignac number, because 19145161 - 2⁹ = 19144649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19145167) 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, 1367505 + ... + 1367518.

It is an arithmetic number, because the mean of its divisors is an integer number (5470048).

Almost surely, 2^19145161 is an apocalyptic number.

It is an amenable number.

19145161 is a deficient number, since it is larger than the sum of its proper divisors (2735031).

19145161 is an equidigital number, since it uses as much as digits as its factorization.

19145161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735030.

The product of its digits is 1080, while the sum is 28.

The square root of 19145161 is about 4375.5183692907. The cubic root of 19145161 is about 267.5179991965.

It can be divided in two parts, 19145 and 161, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 19145161 in words is "nineteen million, one hundred forty-five thousand, one hundred sixty-one".