26521997 has 2 divisors, whose sum is σ = 26521998. Its totient is φ = 26521996.

The previous prime is 26521993. The next prime is 26522003. The reversal of 26521997 is 79912562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18826921 + 7695076 = 4339^2 + 2774^2 .

It is a cyclic number.

It is not a de Polignac number, because 26521997 - 2² = 26521993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26521991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13260998 + 13260999.

It is an arithmetic number, because the mean of its divisors is an integer number (13260999).

Almost surely, 2^26521997 is an apocalyptic number.

It is an amenable number.

26521997 is a deficient number, since it is larger than the sum of its proper divisors (1).

26521997 is an equidigital number, since it uses as much as digits as its factorization.

26521997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 26521997 is about 5149.9511648170. The cubic root of 26521997 is about 298.2190670319.

The spelling of 26521997 in words is "twenty-six million, five hundred twenty-one thousand, nine hundred ninety-seven".