11312311309 has 8 divisors (see below), whose sum is σ = 12899106360. Its totient is φ = 9827890176.

The previous prime is 11312311279. The next prime is 11312311327. The reversal of 11312311309 is 90311321311.

It can be written as a sum of positive squares in 4 ways, for example, as 4641015625 + 6671295684 = 68125^2 + 81678^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11312311309 - 2¹³ = 11312303117 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 (11312311009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25593244 + ... + 25593685.

It is an arithmetic number, because the mean of its divisors is an integer number (1612388295).

Almost surely, 2^11312311309 is an apocalyptic number.

It is an amenable number.

11312311309 is a deficient number, since it is larger than the sum of its proper divisors (1586795051).

11312311309 is a wasteful number, since it uses less digits than its factorization.

11312311309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51186959.

The product of its (nonzero) digits is 486, while the sum is 25.

The spelling of 11312311309 in words is "eleven billion, three hundred twelve million, three hundred eleven thousand, three hundred nine".