19231138749 has 16 divisors (see below), whose sum is σ = 25748161920. Its totient is φ = 12767516160.

The previous prime is 19231138723. The next prime is 19231138753. The reversal of 19231138749 is 94783113291.

It is not a de Polignac number, because 19231138749 - 2¹² = 19231134653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19231138698 and 19231138707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19231138799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1044229 + ... + 1062485.

It is an arithmetic number, because the mean of its divisors is an integer number (1609260120).

Almost surely, 2^19231138749 is an apocalyptic number.

It is an amenable number.

19231138749 is a deficient number, since it is larger than the sum of its proper divisors (6517023171).

19231138749 is a wasteful number, since it uses less digits than its factorization.

19231138749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19700.

The product of its digits is 326592, while the sum is 48.

The spelling of 19231138749 in words is "nineteen billion, two hundred thirty-one million, one hundred thirty-eight thousand, seven hundred forty-nine".