1299785491 has 2 divisors, whose sum is σ = 1299785492. Its totient is φ = 1299785490.

The previous prime is 1299785449. The next prime is 1299785563. The reversal of 1299785491 is 1945879921.

It is a weak prime.

It is an emirp because it is prime and its reverse (1945879921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1299785491 - 2¹³ = 1299777299 is a prime.

It is a super-2 number, since 2×1299785491² = 3378884645228222162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1299785401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649892745 + 649892746.

It is an arithmetic number, because the mean of its divisors is an integer number (649892746).

Almost surely, 2^1299785491 is an apocalyptic number.

1299785491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299785491 is an equidigital number, since it uses as much as digits as its factorization.

1299785491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 55.

The square root of 1299785491 is about 36052.5379273083. The cubic root of 1299785491 is about 1091.3328506319.

The spelling of 1299785491 in words is "one billion, two hundred ninety-nine million, seven hundred eighty-five thousand, four hundred ninety-one".