12261919 has 2 divisors, whose sum is σ = 12261920. Its totient is φ = 12261918.

The previous prime is 12261901. The next prime is 12261941. The reversal of 12261919 is 91916221.

It is a weak prime.

It is an emirp because it is prime and its reverse (91916221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12261919 - 2⁷ = 12261791 is a prime.

It is a super-2 number, since 2×12261919² = 300709315125122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12262919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6130959 + 6130960.

It is an arithmetic number, because the mean of its divisors is an integer number (6130960).

Almost surely, 2^12261919 is an apocalyptic number.

12261919 is a deficient number, since it is larger than the sum of its proper divisors (1).

12261919 is an equidigital number, since it uses as much as digits as its factorization.

12261919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 12261919 is about 3501.7023003105. The cubic root of 12261919 is about 230.5965547083.

The spelling of 12261919 in words is "twelve million, two hundred sixty-one thousand, nine hundred nineteen".