19901018103 has 4 divisors (see below), whose sum is σ = 26534690808. Its totient is φ = 13267345400.

The previous prime is 19901018063. The next prime is 19901018113. The reversal of 19901018103 is 30181010991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19901018103 - 2²² = 19896823799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19901018113) 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, 3316836348 + ... + 3316836353.

It is an arithmetic number, because the mean of its divisors is an integer number (6633672702).

Almost surely, 2^19901018103 is an apocalyptic number.

19901018103 is a deficient number, since it is larger than the sum of its proper divisors (6633672705).

19901018103 is an equidigital number, since it uses as much as digits as its factorization.

19901018103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6633672704.

The product of its (nonzero) digits is 1944, while the sum is 33.

The spelling of 19901018103 in words is "nineteen billion, nine hundred one million, eighteen thousand, one hundred three".