19694161 has 8 divisors (see below), whose sum is σ = 20526120. Its totient is φ = 18872448.

The previous prime is 19694153. The next prime is 19694173. The reversal of 19694161 is 16149691.

It can be written as a sum of positive squares in 4 ways, for example, as 7049025 + 12645136 = 2655^2 + 3556^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19694161 - 2³ = 19694153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19694161.

It is not an unprimeable number, because it can be changed into a prime (19694261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495 + ... + 6451.

It is an arithmetic number, because the mean of its divisors is an integer number (2565765).

Almost surely, 2^19694161 is an apocalyptic number.

It is an amenable number.

19694161 is a deficient number, since it is larger than the sum of its proper divisors (831959).

19694161 is a wasteful number, since it uses less digits than its factorization.

19694161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5123.

The product of its digits is 11664, while the sum is 37.

The square root of 19694161 is about 4437.8103835112. The cubic root of 19694161 is about 270.0510237361.

The spelling of 19694161 in words is "nineteen million, six hundred ninety-four thousand, one hundred sixty-one".