19931256869 has 4 divisors (see below), whose sum is σ = 20083404000. Its totient is φ = 19779109740.

The previous prime is 19931256859. The next prime is 19931256883. The reversal of 19931256869 is 96865213991.

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 not a de Polignac number, because 19931256869 - 2²⁰ = 19930208293 is a prime.

It is a super-2 number, since 2×19931256869² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19931256859) 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, 76073369 + ... + 76073630.

It is an arithmetic number, because the mean of its divisors is an integer number (5020851000).

Almost surely, 2^19931256869 is an apocalyptic number.

It is an amenable number.

19931256869 is a deficient number, since it is larger than the sum of its proper divisors (152147131).

19931256869 is a wasteful number, since it uses less digits than its factorization.

19931256869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152147130.

The product of its digits is 6298560, while the sum is 59.

The spelling of 19931256869 in words is "nineteen billion, nine hundred thirty-one million, two hundred fifty-six thousand, eight hundred sixty-nine".