19913113 has 4 divisors (see below), whose sum is σ = 21723408. Its totient is φ = 18102820.

The previous prime is 19913099. The next prime is 19913119. The reversal of 19913113 is 31131991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31131991 = 11 ⋅2830181.

It is a cyclic number.

It is not a de Polignac number, because 19913113 - 2¹⁷ = 19782041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19913119) 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, 905131 + ... + 905152.

It is an arithmetic number, because the mean of its divisors is an integer number (5430852).

Almost surely, 2^19913113 is an apocalyptic number.

It is an amenable number.

19913113 is a deficient number, since it is larger than the sum of its proper divisors (1810295).

19913113 is a wasteful number, since it uses less digits than its factorization.

19913113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810294.

The product of its digits is 729, while the sum is 28.

The square root of 19913113 is about 4462.4111195631. The cubic root of 19913113 is about 271.0481117178.

The spelling of 19913113 in words is "nineteen million, nine hundred thirteen thousand, one hundred thirteen".