1213312099 has 4 divisors (see below), whose sum is σ = 1228670560. Its totient is φ = 1197953640.

The previous prime is 1213312081. The next prime is 1213312109. The reversal of 1213312099 is 9902133121.

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 1213312099 - 2²¹ = 1211214947 is a prime.

It is a super-3 number, since 3×1213312099³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213312099.

It is not an unprimeable number, because it can be changed into a prime (1213312019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7679112 + ... + 7679269.

It is an arithmetic number, because the mean of its divisors is an integer number (307167640).

Almost surely, 2^1213312099 is an apocalyptic number.

1213312099 is a deficient number, since it is larger than the sum of its proper divisors (15358461).

1213312099 is an equidigital number, since it uses as much as digits as its factorization.

1213312099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15358460.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 1213312099 is about 34832.6298031027. The cubic root of 1213312099 is about 1066.5736320008.

The spelling of 1213312099 in words is "one billion, two hundred thirteen million, three hundred twelve thousand, ninety-nine".