26198617 has 2 divisors, whose sum is σ = 26198618. Its totient is φ = 26198616.

The previous prime is 26198611. The next prime is 26198657. The reversal of 26198617 is 71689162.

It is an a-pointer prime, because the next prime (26198657) can be obtained adding 26198617 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25160256 + 1038361 = 5016^2 + 1019^2 .

It is a cyclic number.

It is not a de Polignac number, because 26198617 - 2³ = 26198609 is a prime.

It is a super-3 number, since 3×26198617³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26198617.

It is not a weakly prime, because it can be changed into another prime (26198611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13099308 + 13099309.

It is an arithmetic number, because the mean of its divisors is an integer number (13099309).

Almost surely, 2^26198617 is an apocalyptic number.

It is an amenable number.

26198617 is a deficient number, since it is larger than the sum of its proper divisors (1).

26198617 is an equidigital number, since it uses as much as digits as its factorization.

26198617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 26198617 is about 5118.4584593411. The cubic root of 26198617 is about 297.0020557095.

It can be divided in two parts, 2619 and 8617, that added together give a square (11236 = 106²).

The spelling of 26198617 in words is "twenty-six million, one hundred ninety-eight thousand, six hundred seventeen".