19131703123 has 4 divisors (see below), whose sum is σ = 20603372608. Its totient is φ = 17660033640.

The previous prime is 19131703121. The next prime is 19131703127. The reversal of 19131703123 is 32130713191.

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 19131703123 - 2¹ = 19131703121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19131703121) 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, 735834723 + ... + 735834748.

It is an arithmetic number, because the mean of its divisors is an integer number (5150843152).

Almost surely, 2^19131703123 is an apocalyptic number.

19131703123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19131703123 is a deficient number, since it is larger than the sum of its proper divisors (1471669485).

19131703123 is a wasteful number, since it uses less digits than its factorization.

19131703123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471669484.

The product of its (nonzero) digits is 3402, while the sum is 31.

The spelling of 19131703123 in words is "nineteen billion, one hundred thirty-one million, seven hundred three thousand, one hundred twenty-three".