19311781049 has 16 divisors (see below), whose sum is σ = 21817036800. Its totient is φ = 16935114000.

The previous prime is 19311781039. The next prime is 19311781061. The reversal of 19311781049 is 94018711391.

It is not a de Polignac number, because 19311781049 - 2⁴ = 19311781033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19311781039) 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, 15002 + ... + 197100.

It is an arithmetic number, because the mean of its divisors is an integer number (1363564800).

Almost surely, 2^19311781049 is an apocalyptic number.

It is an amenable number.

19311781049 is a deficient number, since it is larger than the sum of its proper divisors (2505255751).

19311781049 is a wasteful number, since it uses less digits than its factorization.

19311781049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182452.

The product of its (nonzero) digits is 54432, while the sum is 44.

The spelling of 19311781049 in words is "nineteen billion, three hundred eleven million, seven hundred eighty-one thousand, forty-nine".