26931217 has 2 divisors, whose sum is σ = 26931218. Its totient is φ = 26931216.

The previous prime is 26931193. The next prime is 26931241. The reversal of 26931217 is 71213962.

It is a balanced prime because it is at equal distance from previous prime (26931193) and next prime (26931241).

It can be written as a sum of positive squares in only one way, i.e., 16329681 + 10601536 = 4041^2 + 3256^2 .

It is a cyclic number.

It is not a de Polignac number, because 26931217 - 2⁷ = 26931089 is a prime.

It is equal to p_1679017 and since 26931217 and 1679017 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (26931257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13465608 + 13465609.

It is an arithmetic number, because the mean of its divisors is an integer number (13465609).

Almost surely, 2^26931217 is an apocalyptic number.

It is an amenable number.

26931217 is a deficient number, since it is larger than the sum of its proper divisors (1).

26931217 is an equidigital number, since it uses as much as digits as its factorization.

26931217 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 26931217 is about 5189.5295547863. The cubic root of 26931217 is about 299.7450315131.

The spelling of 26931217 in words is "twenty-six million, nine hundred thirty-one thousand, two hundred seventeen".