12609881 has 2 divisors, whose sum is σ = 12609882. Its totient is φ = 12609880.

The previous prime is 12609853. The next prime is 12609887. The reversal of 12609881 is 18890621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8904256 + 3705625 = 2984^2 + 1925^2 .

It is a cyclic number.

It is not a de Polignac number, because 12609881 - 2¹⁰ = 12608857 is a prime.

It is a super-2 number, since 2×12609881² = 318018197668322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12609887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6304940 + 6304941.

It is an arithmetic number, because the mean of its divisors is an integer number (6304941).

Almost surely, 2^12609881 is an apocalyptic number.

It is an amenable number.

12609881 is a deficient number, since it is larger than the sum of its proper divisors (1).

12609881 is an equidigital number, since it uses as much as digits as its factorization.

12609881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 12609881 is about 3551.0394252951. The cubic root of 12609881 is about 232.7574886555.

The spelling of 12609881 in words is "twelve million, six hundred nine thousand, eight hundred eighty-one".