26381881 has 2 divisors, whose sum is σ = 26381882. Its totient is φ = 26381880.

The previous prime is 26381869. The next prime is 26381903. The reversal of 26381881 is 18818362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22240656 + 4141225 = 4716^2 + 2035^2 .

It is a cyclic number.

It is not a de Polignac number, because 26381881 - 2¹¹ = 26379833 is a prime.

It is a super-2 number, since 2×26381881² = 1392007290196322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26381881.

It is not a weakly prime, because it can be changed into another prime (26381801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13190940 + 13190941.

It is an arithmetic number, because the mean of its divisors is an integer number (13190941).

Almost surely, 2^26381881 is an apocalyptic number.

26381881 is the 3249-th centered pentagonal number.

It is an amenable number.

26381881 is a deficient number, since it is larger than the sum of its proper divisors (1).

26381881 is an equidigital number, since it uses as much as digits as its factorization.

26381881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 37.

The square root of 26381881 is about 5136.3295260332. The cubic root of 26381881 is about 297.6929746273.

The spelling of 26381881 in words is "twenty-six million, three hundred eighty-one thousand, eight hundred eighty-one".