19860311969 has 2 divisors, whose sum is σ = 19860311970. Its totient is φ = 19860311968.

The previous prime is 19860311923. The next prime is 19860311987. The reversal of 19860311969 is 96911306891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19432360000 + 427951969 = 139400^2 + 20687^2 .

It is a cyclic number.

It is not a de Polignac number, because 19860311969 - 2¹⁶ = 19860246433 is a prime.

It is a super-2 number, since 2×19860311969² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19860311969.

It is not a weakly prime, because it can be changed into another prime (19860311909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9930155984 + 9930155985.

It is an arithmetic number, because the mean of its divisors is an integer number (9930155985).

Almost surely, 2^19860311969 is an apocalyptic number.

It is an amenable number.

19860311969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19860311969 is an equidigital number, since it uses as much as digits as its factorization.

19860311969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 53.

The spelling of 19860311969 in words is "nineteen billion, eight hundred sixty million, three hundred eleven thousand, nine hundred sixty-nine".