19231173081 has 6 divisors (see below), whose sum is σ = 27778361130. Its totient is φ = 12820782048.

The previous prime is 19231173067. The next prime is 19231173083. The reversal of 19231173081 is 18037113291.

It can be written as a sum of positive squares in only one way, i.e., 11075457600 + 8155715481 = 105240^2 + 90309^2 .

It is not a de Polignac number, because 19231173081 - 2¹³ = 19231164889 is a prime.

It is a super-2 number, since 2×19231173081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19231173083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1068398496 + ... + 1068398513.

It is an arithmetic number, because the mean of its divisors is an integer number (4629726855).

Almost surely, 2^19231173081 is an apocalyptic number.

It is an amenable number.

19231173081 is a deficient number, since it is larger than the sum of its proper divisors (8547188049).

19231173081 is a wasteful number, since it uses less digits than its factorization.

19231173081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136797015 (or 2136797012 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 19231173081 in words is "nineteen billion, two hundred thirty-one million, one hundred seventy-three thousand, eighty-one".