11312321309 has 2 divisors, whose sum is σ = 11312321310. Its totient is φ = 11312321308.

The previous prime is 11312321287. The next prime is 11312321333. The reversal of 11312321309 is 90312321311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6687641284 + 4624680025 = 81778^2 + 68005^2 .

It is a cyclic number.

It is not a de Polignac number, because 11312321309 - 2²⁴ = 11295544093 is a prime.

It is a super-2 number, since 2×11312321309² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11312321369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5656160654 + 5656160655.

It is an arithmetic number, because the mean of its divisors is an integer number (5656160655).

Almost surely, 2^11312321309 is an apocalyptic number.

It is an amenable number.

11312321309 is a deficient number, since it is larger than the sum of its proper divisors (1).

11312321309 is an equidigital number, since it uses as much as digits as its factorization.

11312321309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 11312321309 in words is "eleven billion, three hundred twelve million, three hundred twenty-one thousand, three hundred nine".