1299521099 has 4 divisors (see below), whose sum is σ = 1311666264. Its totient is φ = 1287375936.

The previous prime is 1299521071. The next prime is 1299521161. The reversal of 1299521099 is 9901259921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1299521099 - 2¹² = 1299517003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1299521009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6072422 + ... + 6072635.

It is an arithmetic number, because the mean of its divisors is an integer number (327916566).

Almost surely, 2^1299521099 is an apocalyptic number.

1299521099 is a deficient number, since it is larger than the sum of its proper divisors (12145165).

1299521099 is a wasteful number, since it uses less digits than its factorization.

1299521099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12145164.

The product of its (nonzero) digits is 131220, while the sum is 47.

The square root of 1299521099 is about 36048.8709809336. The cubic root of 1299521099 is about 1091.2588488720.

The spelling of 1299521099 in words is "one billion, two hundred ninety-nine million, five hundred twenty-one thousand, ninety-nine".