26531287 has 2 divisors, whose sum is σ = 26531288. Its totient is φ = 26531286.

The previous prime is 26531261. The next prime is 26531303. The reversal of 26531287 is 78213562.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26531287 - 2⁷ = 26531159 is a prime.

It is equal to p_1655638 and since 26531287 and 1655638 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 (26531207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13265643 + 13265644.

It is an arithmetic number, because the mean of its divisors is an integer number (13265644).

Almost surely, 2^26531287 is an apocalyptic number.

26531287 is a deficient number, since it is larger than the sum of its proper divisors (1).

26531287 is an equidigital number, since it uses as much as digits as its factorization.

26531287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 26531287 is about 5150.8530361485. The cubic root of 26531287 is about 298.2538825566.

The spelling of 26531287 in words is "twenty-six million, five hundred thirty-one thousand, two hundred eighty-seven".