19278229791013 has 2 divisors, whose sum is σ = 19278229791014. Its totient is φ = 19278229791012.

The previous prime is 19278229790917. The next prime is 19278229791043. The reversal of 19278229791013 is 31019792287291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15563640426084 + 3714589364929 = 3945078^2 + 1927327^2 .

It is a cyclic number.

It is not a de Polignac number, because 19278229791013 - 2²¹ = 19278227693861 is a prime.

It is a super-2 number, since 2×19278229791013² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19278229791043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9639114895506 + 9639114895507.

It is an arithmetic number, because the mean of its divisors is an integer number (9639114895507).

Almost surely, 2^{19278229791013} is an apocalyptic number.

It is an amenable number.

19278229791013 is a deficient number, since it is larger than the sum of its proper divisors (1).

19278229791013 is an equidigital number, since it uses as much as digits as its factorization.

19278229791013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6858432, while the sum is 61.

The spelling of 19278229791013 in words is "nineteen trillion, two hundred seventy-eight billion, two hundred twenty-nine million, seven hundred ninety-one thousand, thirteen".