26979569 has 2 divisors, whose sum is σ = 26979570. Its totient is φ = 26979568.

The previous prime is 26979539. The next prime is 26979583. The reversal of 26979569 is 96597962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25633969 + 1345600 = 5063^2 + 1160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26979569 is a prime.

It is a super-2 number, since 2×26979569² = 1455794286851522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26979569.

It is not a weakly prime, because it can be changed into another prime (26979509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13489784 + 13489785.

It is an arithmetic number, because the mean of its divisors is an integer number (13489785).

Almost surely, 2^26979569 is an apocalyptic number.

It is an amenable number.

26979569 is a deficient number, since it is larger than the sum of its proper divisors (1).

26979569 is an equidigital number, since it uses as much as digits as its factorization.

26979569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 53.

The square root of 26979569 is about 5194.1860767593. The cubic root of 26979569 is about 299.9243105349.

The spelling of 26979569 in words is "twenty-six million, nine hundred seventy-nine thousand, five hundred sixty-nine".