26791997 has 2 divisors, whose sum is σ = 26791998. Its totient is φ = 26791996.

The previous prime is 26791951. The next prime is 26792009. The reversal of 26791997 is 79919762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17422276 + 9369721 = 4174^2 + 3061^2 .

It is a cyclic number.

It is not a de Polignac number, because 26791997 - 2¹⁶ = 26726461 is a prime.

It is a super-2 number, since 2×26791997² = 1435622206496018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26791097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13395998 + 13395999.

It is an arithmetic number, because the mean of its divisors is an integer number (13395999).

Almost surely, 2^26791997 is an apocalyptic number.

It is an amenable number.

26791997 is a deficient number, since it is larger than the sum of its proper divisors (1).

26791997 is an equidigital number, since it uses as much as digits as its factorization.

26791997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 50.

The square root of 26791997 is about 5176.0986273447. The cubic root of 26791997 is about 299.2276317158.

The spelling of 26791997 in words is "twenty-six million, seven hundred ninety-one thousand, nine hundred ninety-seven".