1299543109 has 4 divisors (see below), whose sum is σ = 1308892480. Its totient is φ = 1290193740.

The previous prime is 1299543101. The next prime is 1299543131. The reversal of 1299543109 is 9013459921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1299543109 - 2³ = 1299543101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299543101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4674477 + ... + 4674754.

It is an arithmetic number, because the mean of its divisors is an integer number (327223120).

Almost surely, 2^1299543109 is an apocalyptic number.

It is an amenable number.

1299543109 is a deficient number, since it is larger than the sum of its proper divisors (9349371).

1299543109 is an equidigital number, since it uses as much as digits as its factorization.

1299543109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9349370.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 1299543109 is about 36049.1762596595. The cubic root of 1299543109 is about 1091.2650097241.

The spelling of 1299543109 in words is "one billion, two hundred ninety-nine million, five hundred forty-three thousand, one hundred nine".