26311531 has 2 divisors, whose sum is σ = 26311532. Its totient is φ = 26311530.

The previous prime is 26311513. The next prime is 26311553. The reversal of 26311531 is 13511362.

It is a happy number.

Together with previous prime (26311513) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (26311553) can be obtained adding 26311531 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26311531 - 2¹³ = 26303339 is a prime.

It is a super-2 number, since 2×26311531² = 1384593327127922, which contains 22 as substring.

It is equal to p_1642720 and since 26311531 and 1642720 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 (26311511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13155765 + 13155766.

It is an arithmetic number, because the mean of its divisors is an integer number (13155766).

Almost surely, 2^26311531 is an apocalyptic number.

26311531 is a deficient number, since it is larger than the sum of its proper divisors (1).

26311531 is an equidigital number, since it uses as much as digits as its factorization.

26311531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 22.

The square root of 26311531 is about 5129.4766789605. The cubic root of 26311531 is about 297.4281294269.

Adding to 26311531 its reverse (13511362), we get a palindrome (39822893).

The spelling of 26311531 in words is "twenty-six million, three hundred eleven thousand, five hundred thirty-one".