1299387387373 has 2 divisors, whose sum is σ = 1299387387374. Its totient is φ = 1299387387372.

The previous prime is 1299387387367. The next prime is 1299387387407. The reversal of 1299387387373 is 3737837839921.

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., 1155532551849 + 143854835524 = 1074957^2 + 379282^2 .

It is a cyclic number.

It is not a de Polignac number, because 1299387387373 - 2¹⁷ = 1299387256301 is a prime.

It is a super-2 number, since 2×1299387387373² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299387387343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649693693686 + 649693693687.

It is an arithmetic number, because the mean of its divisors is an integer number (649693693687).

Almost surely, 2^{1299387387373} is an apocalyptic number.

It is an amenable number.

1299387387373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299387387373 is an equidigital number, since it uses as much as digits as its factorization.

1299387387373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288054144, while the sum is 70.

The spelling of 1299387387373 in words is "one trillion, two hundred ninety-nine billion, three hundred eighty-seven million, three hundred eighty-seven thousand, three hundred seventy-three".