26220631 has 2 divisors, whose sum is σ = 26220632. Its totient is φ = 26220630.

The previous prime is 26220629. The next prime is 26220643. The reversal of 26220631 is 13602262.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26220631 - 2¹ = 26220629 is a prime.

It is a super-2 number, since 2×26220631² = 1375042980076322, which contains 22 as substring.

Together with 26220629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26220661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13110315 + 13110316.

It is an arithmetic number, because the mean of its divisors is an integer number (13110316).

Almost surely, 2^26220631 is an apocalyptic number.

26220631 is a deficient number, since it is larger than the sum of its proper divisors (1).

26220631 is an equidigital number, since it uses as much as digits as its factorization.

26220631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 26220631 is about 5120.6084599391. The cubic root of 26220631 is about 297.0852200589.

Adding to 26220631 its reverse (13602262), we get a palindrome (39822893).

The spelling of 26220631 in words is "twenty-six million, two hundred twenty thousand, six hundred thirty-one".