19103913 has 6 divisors (see below), whose sum is σ = 27594554. Its totient is φ = 12735936.

The previous prime is 19103897. The next prime is 19103921. The reversal of 19103913 is 31930191.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 6487209 = 3552^2 + 2547^2 .

It is not a de Polignac number, because 19103913 - 2⁴ = 19103897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19103923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1061320 + ... + 1061337.

Almost surely, 2^19103913 is an apocalyptic number.

It is an amenable number.

19103913 is a deficient number, since it is larger than the sum of its proper divisors (8490641).

19103913 is a wasteful number, since it uses less digits than its factorization.

19103913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122663 (or 2122660 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 27.

The square root of 19103913 is about 4370.8023290925. The cubic root of 19103913 is about 267.3257397085.

The spelling of 19103913 in words is "nineteen million, one hundred three thousand, nine hundred thirteen".