26681489 has 2 divisors, whose sum is σ = 26681490. Its totient is φ = 26681488.

The previous prime is 26681443. The next prime is 26681497. The reversal of 26681489 is 98418662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25200400 + 1481089 = 5020^2 + 1217^2 .

It is a cyclic number.

It is not a de Polignac number, because 26681489 - 2¹² = 26677393 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26681689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13340744 + 13340745.

It is an arithmetic number, because the mean of its divisors is an integer number (13340745).

Almost surely, 2^26681489 is an apocalyptic number.

It is an amenable number.

26681489 is a deficient number, since it is larger than the sum of its proper divisors (1).

26681489 is an equidigital number, since it uses as much as digits as its factorization.

26681489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The square root of 26681489 is about 5165.4127618226. The cubic root of 26681489 is about 298.8156602468.

The spelling of 26681489 in words is "twenty-six million, six hundred eighty-one thousand, four hundred eighty-nine".