26857531 has 2 divisors, whose sum is σ = 26857532. Its totient is φ = 26857530.

The previous prime is 26857529. The next prime is 26857541. The reversal of 26857531 is 13575862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26857531 - 2¹ = 26857529 is a prime.

It is a super-2 number, since 2×26857531² = 1442653942831922, which contains 22 as substring.

Together with 26857529, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26857511) 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, 13428765 + 13428766.

It is an arithmetic number, because the mean of its divisors is an integer number (13428766).

Almost surely, 2^26857531 is an apocalyptic number.

26857531 is a deficient number, since it is larger than the sum of its proper divisors (1).

26857531 is an equidigital number, since it uses as much as digits as its factorization.

26857531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 26857531 is about 5182.4252044771. The cubic root of 26857531 is about 299.4714062127.

The spelling of 26857531 in words is "twenty-six million, eight hundred fifty-seven thousand, five hundred thirty-one".