26518991 has 2 divisors, whose sum is σ = 26518992. Its totient is φ = 26518990.

The previous prime is 26518979. The next prime is 26519011. The reversal of 26518991 is 19981562.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26518991 - 2¹⁸ = 26256847 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26518901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13259495 + 13259496.

It is an arithmetic number, because the mean of its divisors is an integer number (13259496).

Almost surely, 2^26518991 is an apocalyptic number.

26518991 is a deficient number, since it is larger than the sum of its proper divisors (1).

26518991 is an equidigital number, since it uses as much as digits as its factorization.

26518991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 26518991 is about 5149.6593091194. The cubic root of 26518991 is about 298.2077999016.

The spelling of 26518991 in words is "twenty-six million, five hundred eighteen thousand, nine hundred ninety-one".