26917991 has 2 divisors, whose sum is σ = 26917992. Its totient is φ = 26917990.

The previous prime is 26917973. The next prime is 26917997. The reversal of 26917991 is 19971962.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26917991 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 (26917997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13458995 + 13458996.

It is an arithmetic number, because the mean of its divisors is an integer number (13458996).

Almost surely, 2^26917991 is an apocalyptic number.

26917991 is a deficient number, since it is larger than the sum of its proper divisors (1).

26917991 is an equidigital number, since it uses as much as digits as its factorization.

26917991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 44.

The square root of 26917991 is about 5188.2551016695. The cubic root of 26917991 is about 299.6959549224.

The spelling of 26917991 in words is "twenty-six million, nine hundred seventeen thousand, nine hundred ninety-one".