19122813 has 6 divisors (see below), whose sum is σ = 27621854. Its totient is φ = 12748536.

The previous prime is 19122811. The next prime is 19122827. The reversal of 19122813 is 31822191.

It can be written as a sum of positive squares in only one way, i.e., 15539364 + 3583449 = 3942^2 + 1893^2 .

It is not a de Polignac number, because 19122813 - 2¹ = 19122811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19122811) 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, 1062370 + ... + 1062387.

Almost surely, 2^19122813 is an apocalyptic number.

It is an amenable number.

19122813 is a deficient number, since it is larger than the sum of its proper divisors (8499041).

19122813 is a wasteful number, since it uses less digits than its factorization.

19122813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124763 (or 2124760 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 19122813 is about 4372.9638690481. The cubic root of 19122813 is about 267.4138680974.

The spelling of 19122813 in words is "nineteen million, one hundred twenty-two thousand, eight hundred thirteen".