19914091 has 4 divisors (see below), whose sum is σ = 20100312. Its totient is φ = 19727872.

The previous prime is 19914079. The next prime is 19914101. The reversal of 19914091 is 19041991.

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: 19041991 = 43 ⋅442837.

It is a cyclic number.

It is not a de Polignac number, because 19914091 - 2⁷ = 19913963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19914491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92950 + ... + 93163.

It is an arithmetic number, because the mean of its divisors is an integer number (5025078).

Almost surely, 2^19914091 is an apocalyptic number.

19914091 is a deficient number, since it is larger than the sum of its proper divisors (186221).

19914091 is a wasteful number, since it uses less digits than its factorization.

19914091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186220.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 19914091 is about 4462.5207002321. The cubic root of 19914091 is about 271.0525490069.

The spelling of 19914091 in words is "nineteen million, nine hundred fourteen thousand, ninety-one".