19493071 has 4 divisors (see below), whose sum is σ = 20992552. Its totient is φ = 17993592.

The previous prime is 19493063. The next prime is 19493077. The reversal of 19493071 is 17039491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19493071 - 2³ = 19493063 is a prime.

It is a super-2 number, since 2×19493071² = 759959634022082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19493077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749721 + ... + 749746.

It is an arithmetic number, because the mean of its divisors is an integer number (5248138).

Almost surely, 2^19493071 is an apocalyptic number.

19493071 is a deficient number, since it is larger than the sum of its proper divisors (1499481).

19493071 is a wasteful number, since it uses less digits than its factorization.

19493071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499480.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 19493071 is about 4415.0958087000. The cubic root of 19493071 is about 269.1287462462.

The spelling of 19493071 in words is "nineteen million, four hundred ninety-three thousand, seventy-one".