1299089561 has 16 divisors (see below), whose sum is σ = 1714919040. Its totient is φ = 952730880.

The previous prime is 1299089557. The next prime is 1299089591. The reversal of 1299089561 is 1659809921.

It is a cyclic number.

It is not a de Polignac number, because 1299089561 - 2² = 1299089557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1299089521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494906 + ... + 497523.

It is an arithmetic number, because the mean of its divisors is an integer number (107182440).

Almost surely, 2^1299089561 is an apocalyptic number.

1299089561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1299089561 is a deficient number, since it is larger than the sum of its proper divisors (415829479).

1299089561 is a wasteful number, since it uses less digits than its factorization.

1299089561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992464.

The product of its (nonzero) digits is 349920, while the sum is 50.

The square root of 1299089561 is about 36042.8850260353. The cubic root of 1299089561 is about 1091.1380423693.

The spelling of 1299089561 in words is "one billion, two hundred ninety-nine million, eighty-nine thousand, five hundred sixty-one".