123311440309 has 2 divisors, whose sum is σ = 123311440310. Its totient is φ = 123311440308.

The previous prime is 123311440283. The next prime is 123311440337. The reversal of 123311440309 is 903044113321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107252975025 + 16058465284 = 327495^2 + 126722^2 .

It is a cyclic number.

It is not a de Polignac number, because 123311440309 - 2⁵ = 123311440277 is a prime.

It is a super-2 number, since 2×123311440309² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123311540309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61655720154 + 61655720155.

It is an arithmetic number, because the mean of its divisors is an integer number (61655720155).

Almost surely, 2^123311440309 is an apocalyptic number.

It is an amenable number.

123311440309 is a deficient number, since it is larger than the sum of its proper divisors (1).

123311440309 is an equidigital number, since it uses as much as digits as its factorization.

123311440309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 123311440309 in words is "one hundred twenty-three billion, three hundred eleven million, four hundred forty thousand, three hundred nine".