619497794921 has 2 divisors, whose sum is σ = 619497794922. Its totient is φ = 619497794920.

The previous prime is 619497794887. The next prime is 619497794987. The reversal of 619497794921 is 129497794916.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619463443600 + 34351321 = 787060^2 + 5861^2 .

It is a cyclic number.

It is not a de Polignac number, because 619497794921 - 2¹⁸ = 619497532777 is a prime.

It is not a weakly prime, because it can be changed into another prime (619497790921) 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 as a sum of consecutive naturals, namely, 309748897460 + 309748897461.

It is an arithmetic number, because the mean of its divisors is an integer number (309748897461).

Almost surely, 2^619497794921 is an apocalyptic number.

It is an amenable number.

619497794921 is a deficient number, since it is larger than the sum of its proper divisors (1).

619497794921 is an equidigital number, since it uses as much as digits as its factorization.

619497794921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61725888, while the sum is 68.

The spelling of 619497794921 in words is "six hundred nineteen billion, four hundred ninety-seven million, seven hundred ninety-four thousand, nine hundred twenty-one".