19931227685 has 4 divisors (see below), whose sum is σ = 23917473228. Its totient is φ = 15944982144.

The previous prime is 19931227681. The next prime is 19931227831. The reversal of 19931227685 is 58672213991.

It is a Cunningham number, because it is equal to 141178²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58672213991 = 70067 ⋅837373.

It can be written as a sum of positive squares in 2 ways, for example, as 7175106436 + 12756121249 = 84706^2 + 112943^2 .

It is a cyclic number.

It is not a de Polignac number, because 19931227685 - 2² = 19931227681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19931227681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1993122764 + ... + 1993122773.

It is an arithmetic number, because the mean of its divisors is an integer number (5979368307).

Almost surely, 2^19931227685 is an apocalyptic number.

It is an amenable number.

19931227685 is a deficient number, since it is larger than the sum of its proper divisors (3986245543).

19931227685 is an equidigital number, since it uses as much as digits as its factorization.

19931227685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986245542.

The product of its digits is 1632960, while the sum is 53.

The spelling of 19931227685 in words is "nineteen billion, nine hundred thirty-one million, two hundred twenty-seven thousand, six hundred eighty-five".