12311501 has 2 divisors, whose sum is σ = 12311502. Its totient is φ = 12311500.

The previous prime is 12311443. The next prime is 12311503. The reversal of 12311501 is 10511321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9424900 + 2886601 = 3070^2 + 1699^2 .

It is a cyclic number.

It is not a de Polignac number, because 12311501 - 2¹⁴ = 12295117 is a prime.

It is a Sophie Germain prime.

Together with 12311503, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12311503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155750 + 6155751.

It is an arithmetic number, because the mean of its divisors is an integer number (6155751).

Almost surely, 2^12311501 is an apocalyptic number.

It is an amenable number.

12311501 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311501 is an equidigital number, since it uses as much as digits as its factorization.

12311501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 12311501 is about 3508.7748574111. The cubic root of 12311501 is about 230.9069482730.

Adding to 12311501 its reverse (10511321), we get a palindrome (22822822).

The spelling of 12311501 in words is "twelve million, three hundred eleven thousand, five hundred one".