26989621 has 2 divisors, whose sum is σ = 26989622. Its totient is φ = 26989620.

The previous prime is 26989607. The next prime is 26989661. The reversal of 26989621 is 12698962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22193521 + 4796100 = 4711^2 + 2190^2 .

It is a cyclic number.

It is not a de Polignac number, because 26989621 - 2¹¹ = 26987573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26989661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13494810 + 13494811.

It is an arithmetic number, because the mean of its divisors is an integer number (13494811).

Almost surely, 2^26989621 is an apocalyptic number.

It is an amenable number.

26989621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26989621 is an equidigital number, since it uses as much as digits as its factorization.

26989621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 26989621 is about 5195.1536069687. The cubic root of 26989621 is about 299.9615543326.

The spelling of 26989621 in words is "twenty-six million, nine hundred eighty-nine thousand, six hundred twenty-one".