12611993 has 2 divisors, whose sum is σ = 12611994. Its totient is φ = 12611992.

The previous prime is 12611987. The next prime is 12611999. The reversal of 12611993 is 39911621.

It is a balanced prime because it is at equal distance from previous prime (12611987) and next prime (12611999).

It can be written as a sum of positive squares in only one way, i.e., 10061584 + 2550409 = 3172^2 + 1597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12611993 is a prime.

It is equal to p₈₂₅₅₆₆ and since 12611993 and 825566 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12611999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6305996 + 6305997.

It is an arithmetic number, because the mean of its divisors is an integer number (6305997).

Almost surely, 2^12611993 is an apocalyptic number.

It is an amenable number.

12611993 is a deficient number, since it is larger than the sum of its proper divisors (1).

12611993 is an equidigital number, since it uses as much as digits as its factorization.

12611993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 32.

The square root of 12611993 is about 3551.3367905621. The cubic root of 12611993 is about 232.7704826024.

The spelling of 12611993 in words is "twelve million, six hundred eleven thousand, nine hundred ninety-three".