1299220913 has 2 divisors, whose sum is σ = 1299220914. Its totient is φ = 1299220912.

The previous prime is 1299220891. The next prime is 1299220933. The reversal of 1299220913 is 3190229921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1152738304 + 146482609 = 33952^2 + 12103^2 .

It is an emirp because it is prime and its reverse (3190229921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1299220913 - 2²⁴ = 1282443697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1299220933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649610456 + 649610457.

It is an arithmetic number, because the mean of its divisors is an integer number (649610457).

Almost surely, 2^1299220913 is an apocalyptic number.

It is an amenable number.

1299220913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299220913 is an equidigital number, since it uses as much as digits as its factorization.

1299220913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 1299220913 is about 36044.7071426583. The cubic root of 1299220913 is about 1091.1748164143.

The spelling of 1299220913 in words is "one billion, two hundred ninety-nine million, two hundred twenty thousand, nine hundred thirteen".