19915901243 has 8 divisors (see below), whose sum is σ = 22858718688. Its totient is φ = 16997505984.

The previous prime is 19915901231. The next prime is 19915901261. The reversal of 19915901243 is 34210951991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19915901243 - 2¹⁶ = 19915835707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19915901194 and 19915901203.

It is not an unprimeable number, because it can be changed into a prime (19915961243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6103796 + ... + 6107057.

It is an arithmetic number, because the mean of its divisors is an integer number (2857339836).

Almost surely, 2^19915901243 is an apocalyptic number.

19915901243 is a deficient number, since it is larger than the sum of its proper divisors (2942817445).

19915901243 is a wasteful number, since it uses less digits than its factorization.

19915901243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12211093.

The product of its (nonzero) digits is 87480, while the sum is 44.

The spelling of 19915901243 in words is "nineteen billion, nine hundred fifteen million, nine hundred one thousand, two hundred forty-three".