26931257 has 2 divisors, whose sum is σ = 26931258. Its totient is φ = 26931256.

The previous prime is 26931241. The next prime is 26931271. The reversal of 26931257 is 75213962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26584336 + 346921 = 5156^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 26931257 - 2⁴ = 26931241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26931217) 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, 13465628 + 13465629.

It is an arithmetic number, because the mean of its divisors is an integer number (13465629).

Almost surely, 2^26931257 is an apocalyptic number.

It is an amenable number.

26931257 is a deficient number, since it is larger than the sum of its proper divisors (1).

26931257 is an equidigital number, since it uses as much as digits as its factorization.

26931257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 35.

The square root of 26931257 is about 5189.5334086987. The cubic root of 26931257 is about 299.7451799133.

The spelling of 26931257 in words is "twenty-six million, nine hundred thirty-one thousand, two hundred fifty-seven".