19116401 has 4 divisors (see below), whose sum is σ = 19136832. Its totient is φ = 19095972.

The previous prime is 19116379. The next prime is 19116403. The reversal of 19116401 is 10461191.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19116401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19116403) 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, 8741 + ... + 10706.

It is an arithmetic number, because the mean of its divisors is an integer number (4784208).

Almost surely, 2^19116401 is an apocalyptic number.

It is an amenable number.

19116401 is a deficient number, since it is larger than the sum of its proper divisors (20431).

19116401 is an equidigital number, since it uses as much as digits as its factorization.

19116401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20430.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 19116401 is about 4372.2306663761. The cubic root of 19116401 is about 267.3839762364.

Adding to 19116401 its reverse (10461191), we get a palindrome (29577592).

The spelling of 19116401 in words is "nineteen million, one hundred sixteen thousand, four hundred one".