26782981 has 2 divisors, whose sum is σ = 26782982. Its totient is φ = 26782980.

The previous prime is 26782933. The next prime is 26782993. The reversal of 26782981 is 18928762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21538881 + 5244100 = 4641^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 26782981 - 2²³ = 18394373 is a prime.

It is a super-2 number, since 2×26782981² = 1434656142492722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26782901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13391490 + 13391491.

It is an arithmetic number, because the mean of its divisors is an integer number (13391491).

Almost surely, 2^26782981 is an apocalyptic number.

It is an amenable number.

26782981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26782981 is an equidigital number, since it uses as much as digits as its factorization.

26782981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 26782981 is about 5175.2276278440. The cubic root of 26782981 is about 299.1940627486.

The spelling of 26782981 in words is "twenty-six million, seven hundred eighty-two thousand, nine hundred eighty-one".