1299172669 has 2 divisors, whose sum is σ = 1299172670. Its totient is φ = 1299172668.

The previous prime is 1299172663. The next prime is 1299172673. The reversal of 1299172669 is 9662719921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1054625625 + 244547044 = 32475^2 + 15638^2 .

It is an emirp because it is prime and its reverse (9662719921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1299172669 - 2³ = 1299172661 is a prime.

It is a super-2 number, since 2×1299172669² = 3375699247753167122, which contains 22 as substring.

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, 649586334 + 649586335.

It is an arithmetic number, because the mean of its divisors is an integer number (649586335).

Almost surely, 2^1299172669 is an apocalyptic number.

It is an amenable number.

1299172669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299172669 is an equidigital number, since it uses as much as digits as its factorization.

1299172669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 1299172669 is about 36044.0379119765. The cubic root of 1299172669 is about 1091.1613100406.

The spelling of 1299172669 in words is "one billion, two hundred ninety-nine million, one hundred seventy-two thousand, six hundred sixty-nine".