26172857 has 2 divisors, whose sum is σ = 26172858. Its totient is φ = 26172856.

The previous prime is 26172851. The next prime is 26172859. The reversal of 26172857 is 75827162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25999801 + 173056 = 5099^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 26172857 - 2⁶ = 26172793 is a prime.

Together with 26172859, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26172857.

It is not a weakly prime, because it can be changed into another prime (26172851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13086428 + 13086429.

It is an arithmetic number, because the mean of its divisors is an integer number (13086429).

Almost surely, 2^26172857 is an apocalyptic number.

It is an amenable number.

26172857 is a deficient number, since it is larger than the sum of its proper divisors (1).

26172857 is an equidigital number, since it uses as much as digits as its factorization.

26172857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 38.

The square root of 26172857 is about 5115.9414578355. The cubic root of 26172857 is about 296.9046805709.

The spelling of 26172857 in words is "twenty-six million, one hundred seventy-two thousand, eight hundred fifty-seven".