26931481 has 2 divisors, whose sum is σ = 26931482. Its totient is φ = 26931480.

The previous prime is 26931479. The next prime is 26931497. The reversal of 26931481 is 18413962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26265625 + 665856 = 5125^2 + 816^2 .

It is a cyclic number.

It is not a de Polignac number, because 26931481 - 2¹ = 26931479 is a prime.

It is a super-2 number, since 2×26931481² = 1450609337706722, which contains 22 as substring.

Together with 26931479, it forms a pair of twin primes.

It is equal to p_1679029 and since 26931481 and 1679029 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (26931461) 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, 13465740 + 13465741.

It is an arithmetic number, because the mean of its divisors is an integer number (13465741).

Almost surely, 2^26931481 is an apocalyptic number.

It is an amenable number.

26931481 is a deficient number, since it is larger than the sum of its proper divisors (1).

26931481 is an equidigital number, since it uses as much as digits as its factorization.

26931481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 26931481 is about 5189.5549905555. The cubic root of 26931481 is about 299.7460109518.

The spelling of 26931481 in words is "twenty-six million, nine hundred thirty-one thousand, four hundred eighty-one".