26172613 has 2 divisors, whose sum is σ = 26172614. Its totient is φ = 26172612.

The previous prime is 26172611. The next prime is 26172631. The reversal of 26172613 is 31627162.

26172613 = 3617² + 3618².

Together with next prime (26172631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13089924 + 13082689 = 3618^2 + 3617^2 .

It is a cyclic number.

It is not a de Polignac number, because 26172613 - 2¹ = 26172611 is a prime.

Together with 26172611, it forms a pair of twin primes.

It is equal to p_1634626 and since 26172613 and 1634626 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26172611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13086306 + 13086307.

It is an arithmetic number, because the mean of its divisors is an integer number (13086307).

Almost surely, 2^26172613 is an apocalyptic number.

26172613 is the 3618-th centered square number.

It is an amenable number.

26172613 is a deficient number, since it is larger than the sum of its proper divisors (1).

26172613 is an equidigital number, since it uses as much as digits as its factorization.

26172613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

The square root of 26172613 is about 5115.9176107518. The cubic root of 26172613 is about 296.9037579233.

Adding to 26172613 its reverse (31627162), we get a palindrome (57799775).

The spelling of 26172613 in words is "twenty-six million, one hundred seventy-two thousand, six hundred thirteen".