19319477491391 has 32 divisors (see below), whose sum is σ = 24188431507968. Its totient is φ = 14990639984640.

The previous prime is 19319477491351. The next prime is 19319477491393.

19319477491391 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19319477491391 is a prime.

It is a super-2 number, since 2×19319477491391² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19319477491393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16883375 + ... + 17991311.

It is an arithmetic number, because the mean of its divisors is an integer number (755888484624).

Almost surely, 2^{19319477491391} is an apocalyptic number.

19319477491391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19319477491391 is a deficient number, since it is larger than the sum of its proper divisors (4868954016577).

19319477491391 is a wasteful number, since it uses less digits than its factorization.

19319477491391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108911.

The product of its digits is 46294416, while the sum is 68.

The spelling of 19319477491391 in words is "nineteen trillion, three hundred nineteen billion, four hundred seventy-seven million, four hundred ninety-one thousand, three hundred ninety-one".