26901661 has 2 divisors, whose sum is σ = 26901662. Its totient is φ = 26901660.

The previous prime is 26901659. The next prime is 26901733. The reversal of 26901661 is 16610962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17690436 + 9211225 = 4206^2 + 3035^2 .

It is a cyclic number.

It is not a de Polignac number, because 26901661 - 2¹ = 26901659 is a prime.

Together with 26901659, 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 (26901631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13450830 + 13450831.

It is an arithmetic number, because the mean of its divisors is an integer number (13450831).

Almost surely, 2^26901661 is an apocalyptic number.

It is an amenable number.

26901661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26901661 is an equidigital number, since it uses as much as digits as its factorization.

26901661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 26901661 is about 5186.6811160896. The cubic root of 26901661 is about 299.6353384008.

The spelling of 26901661 in words is "twenty-six million, nine hundred one thousand, six hundred sixty-one".