19969013 has 4 divisors (see below), whose sum is σ = 20166828. Its totient is φ = 19771200.

The previous prime is 19968997. The next prime is 19969043. The reversal of 19969013 is 31096991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31096991 = 101 ⋅307891.

It can be written as a sum of positive squares in 2 ways, for example, as 13853284 + 6115729 = 3722^2 + 2473^2 .

It is a cyclic number.

It is not a de Polignac number, because 19969013 - 2⁴ = 19968997 is a prime.

It is a super-2 number, since 2×19969013² = 797522960388338, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19969043) 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, 98756 + ... + 98957.

It is an arithmetic number, because the mean of its divisors is an integer number (5041707).

Almost surely, 2^19969013 is an apocalyptic number.

It is an amenable number.

19969013 is a deficient number, since it is larger than the sum of its proper divisors (197815).

19969013 is a wasteful number, since it uses less digits than its factorization.

19969013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197814.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 19969013 is about 4468.6701601259. The cubic root of 19969013 is about 271.3015031002.

The spelling of 19969013 in words is "nineteen million, nine hundred sixty-nine thousand, thirteen".