26912981 has 2 divisors, whose sum is σ = 26912982. Its totient is φ = 26912980.

The previous prime is 26912971. The next prime is 26913037. The reversal of 26912981 is 18921962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26357956 + 555025 = 5134^2 + 745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26912981 is a prime.

It is a super-2 number, since 2×26912981² = 1448617092612722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26912971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13456490 + 13456491.

It is an arithmetic number, because the mean of its divisors is an integer number (13456491).

Almost surely, 2^26912981 is an apocalyptic number.

It is an amenable number.

26912981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26912981 is an equidigital number, since it uses as much as digits as its factorization.

26912981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 26912981 is about 5187.7722579157. The cubic root of 26912981 is about 299.6773605444.

The spelling of 26912981 in words is "twenty-six million, nine hundred twelve thousand, nine hundred eighty-one".