26266981 has 4 divisors (see below), whose sum is σ = 28287532. Its totient is φ = 24246432.

The previous prime is 26266979. The next prime is 26266991. The reversal of 26266981 is 18966262.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17564481 + 8702500 = 4191^2 + 2950^2 .

It is a cyclic number.

It is not a de Polignac number, because 26266981 - 2¹ = 26266979 is a prime.

It is a super-2 number, since 2×26266981² = 1379908581708722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26266931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010256 + ... + 1010281.

It is an arithmetic number, because the mean of its divisors is an integer number (7071883).

Almost surely, 2^26266981 is an apocalyptic number.

It is an amenable number.

26266981 is a deficient number, since it is larger than the sum of its proper divisors (2020551).

26266981 is a wasteful number, since it uses less digits than its factorization.

26266981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020550.

The product of its digits is 62208, while the sum is 40.

The square root of 26266981 is about 5125.1322909755. The cubic root of 26266981 is about 297.2601687378.

The spelling of 26266981 in words is "twenty-six million, two hundred sixty-six thousand, nine hundred eighty-one".