1939802208691 has 4 divisors (see below), whose sum is σ = 2041897061800. Its totient is φ = 1837707355584.

The previous prime is 1939802208637. The next prime is 1939802208697. The reversal of 1939802208691 is 1968022089391.

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 1939802208691 - 2¹⁵ = 1939802175923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1939802208697) 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, 51047426526 + ... + 51047426563.

It is an arithmetic number, because the mean of its divisors is an integer number (510474265450).

Almost surely, 2^{1939802208691} is an apocalyptic number.

1939802208691 is a deficient number, since it is larger than the sum of its proper divisors (102094853109).

1939802208691 is a wasteful number, since it uses less digits than its factorization.

1939802208691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102094853108.

The product of its (nonzero) digits is 3359232, while the sum is 58.

The spelling of 1939802208691 in words is "one trillion, nine hundred thirty-nine billion, eight hundred two million, two hundred eight thousand, six hundred ninety-one".