19097813 has 4 divisors (see below), whose sum is σ = 21826080. Its totient is φ = 16369548.

The previous prime is 19097803. The next prime is 19097833. The reversal of 19097813 is 31879091.

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: 31879091 = 29 ⋅1099279.

It is a cyclic number.

It is not a de Polignac number, because 19097813 - 2¹² = 19093717 is a prime.

It is a super-2 number, since 2×19097813² = 729452922765938, 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 (19097803) 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, 1364123 + ... + 1364136.

It is an arithmetic number, because the mean of its divisors is an integer number (5456520).

Almost surely, 2^19097813 is an apocalyptic number.

It is an amenable number.

19097813 is a deficient number, since it is larger than the sum of its proper divisors (2728267).

19097813 is an equidigital number, since it uses as much as digits as its factorization.

19097813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728266.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 19097813 is about 4370.1044609940. The cubic root of 19097813 is about 267.2972837476.

The spelling of 19097813 in words is "nineteen million, ninety-seven thousand, eight hundred thirteen".