1299521097 has 32 divisors (see below), whose sum is σ = 2201926400. Its totient is φ = 742017024.

The previous prime is 1299521071. The next prime is 1299521161. The reversal of 1299521097 is 7901259921.

It is not a de Polignac number, because 1299521097 - 2⁷ = 1299520969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1299521057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 481929 + ... + 484617.

It is an arithmetic number, because the mean of its divisors is an integer number (68810200).

Almost surely, 2^1299521097 is an apocalyptic number.

It is an amenable number.

1299521097 is a deficient number, since it is larger than the sum of its proper divisors (902405303).

1299521097 is a wasteful number, since it uses less digits than its factorization.

1299521097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5262 (or 5256 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 1299521097 is about 36048.8709531935. The cubic root of 1299521097 is about 1091.2588483122.

The spelling of 1299521097 in words is "one billion, two hundred ninety-nine million, five hundred twenty-one thousand, ninety-seven".