26975981 has 2 divisors, whose sum is σ = 26975982. Its totient is φ = 26975980.

The previous prime is 26975959. The next prime is 26976013. The reversal of 26975981 is 18957962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26574025 + 401956 = 5155^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 26975981 - 2⁶ = 26975917 is a prime.

It is a super-2 number, since 2×26975981² = 1455407101824722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26975911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13487990 + 13487991.

It is an arithmetic number, because the mean of its divisors is an integer number (13487991).

Almost surely, 2^26975981 is an apocalyptic number.

It is an amenable number.

26975981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26975981 is an equidigital number, since it uses as much as digits as its factorization.

26975981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 26975981 is about 5193.8406791121. The cubic root of 26975981 is about 299.9110143485.

The spelling of 26975981 in words is "twenty-six million, nine hundred seventy-five thousand, nine hundred eighty-one".