19122161 has 4 divisors (see below), whose sum is σ = 20247012. Its totient is φ = 17997312.

The previous prime is 19122149. The next prime is 19122163. The reversal of 19122161 is 16122191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16122191 = 499 ⋅32309.

It can be written as a sum of positive squares in 2 ways, for example, as 6477025 + 12645136 = 2545^2 + 3556^2 .

It is a cyclic number.

It is not a de Polignac number, because 19122161 - 2¹⁴ = 19105777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19122163) 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, 562400 + ... + 562433.

It is an arithmetic number, because the mean of its divisors is an integer number (5061753).

Almost surely, 2^19122161 is an apocalyptic number.

It is an amenable number.

19122161 is a deficient number, since it is larger than the sum of its proper divisors (1124851).

19122161 is a wasteful number, since it uses less digits than its factorization.

19122161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124850.

The product of its digits is 216, while the sum is 23.

The square root of 19122161 is about 4372.8893194317. The cubic root of 19122161 is about 267.4108288684.

The spelling of 19122161 in words is "nineteen million, one hundred twenty-two thousand, one hundred sixty-one".