26191229 has 2 divisors, whose sum is σ = 26191230. Its totient is φ = 26191228.

The previous prime is 26191201. The next prime is 26191247. The reversal of 26191229 is 92219162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23716900 + 2474329 = 4870^2 + 1573^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26191229 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 26191195 and 26191204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26191279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13095614 + 13095615.

It is an arithmetic number, because the mean of its divisors is an integer number (13095615).

Almost surely, 2^26191229 is an apocalyptic number.

It is an amenable number.

26191229 is a deficient number, since it is larger than the sum of its proper divisors (1).

26191229 is an equidigital number, since it uses as much as digits as its factorization.

26191229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 26191229 is about 5117.7367067875. The cubic root of 26191229 is about 296.9741349293.

The spelling of 26191229 in words is "twenty-six million, one hundred ninety-one thousand, two hundred twenty-nine".