26691013 has 2 divisors, whose sum is σ = 26691014. Its totient is φ = 26691012.

The previous prime is 26691001. The next prime is 26691047. The reversal of 26691013 is 31019662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22439169 + 4251844 = 4737^2 + 2062^2 .

It is a cyclic number.

It is not a de Polignac number, because 26691013 - 2⁵ = 26690981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26691073) 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, 13345506 + 13345507.

It is an arithmetic number, because the mean of its divisors is an integer number (13345507).

Almost surely, 2^26691013 is an apocalyptic number.

It is an amenable number.

26691013 is a deficient number, since it is larger than the sum of its proper divisors (1).

26691013 is an equidigital number, since it uses as much as digits as its factorization.

26691013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 26691013 is about 5166.3345807255. The cubic root of 26691013 is about 298.8512102592.

The spelling of 26691013 in words is "twenty-six million, six hundred ninety-one thousand, thirteen".