26805631 has 2 divisors, whose sum is σ = 26805632. Its totient is φ = 26805630.

The previous prime is 26805629. The next prime is 26805661. The reversal of 26805631 is 13650862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26805631 - 2¹ = 26805629 is a prime.

It is a super-3 number, since 3×26805631³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 26805629, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 26805593 and 26805602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26805661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13402815 + 13402816.

It is an arithmetic number, because the mean of its divisors is an integer number (13402816).

Almost surely, 2^26805631 is an apocalyptic number.

26805631 is a deficient number, since it is larger than the sum of its proper divisors (1).

26805631 is an equidigital number, since it uses as much as digits as its factorization.

26805631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 26805631 is about 5177.4154749257. The cubic root of 26805631 is about 299.2783804239.

The spelling of 26805631 in words is "twenty-six million, eight hundred five thousand, six hundred thirty-one".