26481981 has 4 divisors (see below), whose sum is σ = 35309312. Its totient is φ = 17654652.

The previous prime is 26481893. The next prime is 26481989. The reversal of 26481981 is 18918462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 26481981 - 2¹³ = 26473789 is a prime.

It is a super-2 number, since 2×26481981² = 1402590635368722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26481989) 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, 4413661 + ... + 4413666.

It is an arithmetic number, because the mean of its divisors is an integer number (8827328).

Almost surely, 2^26481981 is an apocalyptic number.

It is an amenable number.

26481981 is a deficient number, since it is larger than the sum of its proper divisors (8827331).

26481981 is an equidigital number, since it uses as much as digits as its factorization.

26481981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8827330.

The product of its digits is 27648, while the sum is 39.

The square root of 26481981 is about 5146.0646128862. The cubic root of 26481981 is about 298.0690086868.

The spelling of 26481981 in words is "twenty-six million, four hundred eighty-one thousand, nine hundred eighty-one".