26445721 has 2 divisors, whose sum is σ = 26445722. Its totient is φ = 26445720.

The previous prime is 26445691. The next prime is 26445773. The reversal of 26445721 is 12754462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19263321 + 7182400 = 4389^2 + 2680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26445721 is a prime.

It is not a weakly prime, because it can be changed into another prime (26745721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13222860 + 13222861.

It is an arithmetic number, because the mean of its divisors is an integer number (13222861).

Almost surely, 2^26445721 is an apocalyptic number.

It is an amenable number.

26445721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26445721 is an equidigital number, since it uses as much as digits as its factorization.

26445721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 31.

The square root of 26445721 is about 5142.5403255590. The cubic root of 26445721 is about 297.9329045827.

The spelling of 26445721 in words is "twenty-six million, four hundred forty-five thousand, seven hundred twenty-one".