26749991 has 2 divisors, whose sum is σ = 26749992. Its totient is φ = 26749990.

The previous prime is 26749979. The next prime is 26749997. The reversal of 26749991 is 19994762.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26749991 - 2¹⁴ = 26733607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26749997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13374995 + 13374996.

It is an arithmetic number, because the mean of its divisors is an integer number (13374996).

Almost surely, 2^26749991 is an apocalyptic number.

26749991 is a deficient number, since it is larger than the sum of its proper divisors (1).

26749991 is an equidigital number, since it uses as much as digits as its factorization.

26749991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 26749991 is about 5172.0393463314. The cubic root of 26749991 is about 299.0711679453.

The spelling of 26749991 in words is "twenty-six million, seven hundred forty-nine thousand, nine hundred ninety-one".