26391251 has 2 divisors, whose sum is σ = 26391252. Its totient is φ = 26391250.

The previous prime is 26391193. The next prime is 26391257. The reversal of 26391251 is 15219362.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26391251 is a prime.

It is not a weakly prime, because it can be changed into another prime (26391257) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13195625 + 13195626.

It is an arithmetic number, because the mean of its divisors is an integer number (13195626).

Almost surely, 2^26391251 is an apocalyptic number.

26391251 is a deficient number, since it is larger than the sum of its proper divisors (1).

26391251 is an equidigital number, since it uses as much as digits as its factorization.

26391251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 26391251 is about 5137.2415750089. The cubic root of 26391251 is about 297.7282141288.

The spelling of 26391251 in words is "twenty-six million, three hundred ninety-one thousand, two hundred fifty-one".