26621891 has 2 divisors, whose sum is σ = 26621892. Its totient is φ = 26621890.

The previous prime is 26621887. The next prime is 26621893. The reversal of 26621891 is 19812662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26621891 - 2² = 26621887 is a prime.

Together with 26621893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26621893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13310945 + 13310946.

It is an arithmetic number, because the mean of its divisors is an integer number (13310946).

Almost surely, 2^26621891 is an apocalyptic number.

26621891 is a deficient number, since it is larger than the sum of its proper divisors (1).

26621891 is an equidigital number, since it uses as much as digits as its factorization.

26621891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 26621891 is about 5159.6405882581. The cubic root of 26621891 is about 298.5930078560.

The spelling of 26621891 in words is "twenty-six million, six hundred twenty-one thousand, eight hundred ninety-one".