26981861 has 4 divisors (see below), whose sum is σ = 27912300. Its totient is φ = 26051424.

The previous prime is 26981849. The next prime is 26981887. The reversal of 26981861 is 16818962.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16818962 = 2 ⋅8409481.

It can be written as a sum of positive squares in 2 ways, for example, as 14485636 + 12496225 = 3806^2 + 3535^2 .

It is a cyclic number.

It is not a de Polignac number, because 26981861 - 2⁶ = 26981797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26981161) 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, 465176 + ... + 465233.

It is an arithmetic number, because the mean of its divisors is an integer number (6978075).

Almost surely, 2^26981861 is an apocalyptic number.

It is an amenable number.

26981861 is a deficient number, since it is larger than the sum of its proper divisors (930439).

26981861 is an equidigital number, since it uses as much as digits as its factorization.

26981861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930438.

The product of its digits is 41472, while the sum is 41.

The square root of 26981861 is about 5194.4067033685. The cubic root of 26981861 is about 299.9328034684.

The spelling of 26981861 in words is "twenty-six million, nine hundred eighty-one thousand, eight hundred sixty-one".