1299172663 has 2 divisors, whose sum is σ = 1299172664. Its totient is φ = 1299172662.

The previous prime is 1299172661. The next prime is 1299172669. The reversal of 1299172663 is 3662719921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1299172663 - 2¹ = 1299172661 is a prime.

Together with 1299172661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299172661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649586331 + 649586332.

It is an arithmetic number, because the mean of its divisors is an integer number (649586332).

Almost surely, 2^1299172663 is an apocalyptic number.

1299172663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299172663 is an equidigital number, since it uses as much as digits as its factorization.

1299172663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 1299172663 is about 36044.0378287450. The cubic root of 1299172663 is about 1091.1613083608.

The spelling of 1299172663 in words is "one billion, two hundred ninety-nine million, one hundred seventy-two thousand, six hundred sixty-three".