26319721 has 2 divisors, whose sum is σ = 26319722. Its totient is φ = 26319720.

The previous prime is 26319707. The next prime is 26319737. The reversal of 26319721 is 12791362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23040000 + 3279721 = 4800^2 + 1811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26319721 is a prime.

It is not a weakly prime, because it can be changed into another prime (26319781) 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, 13159860 + 13159861.

It is an arithmetic number, because the mean of its divisors is an integer number (13159861).

Almost surely, 2^26319721 is an apocalyptic number.

It is an amenable number.

26319721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26319721 is an equidigital number, since it uses as much as digits as its factorization.

26319721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 26319721 is about 5130.2749438992. The cubic root of 26319721 is about 297.4589864135.

The spelling of 26319721 in words is "twenty-six million, three hundred nineteen thousand, seven hundred twenty-one".