26557129 has 2 divisors, whose sum is σ = 26557130. Its totient is φ = 26557128.

The previous prime is 26557121. The next prime is 26557133. The reversal of 26557129 is 92175562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26501904 + 55225 = 5148^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 26557129 - 2³ = 26557121 is a prime.

It is a super-2 number, since 2×26557129² = 1410562201445282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26557121) 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, 13278564 + 13278565.

It is an arithmetic number, because the mean of its divisors is an integer number (13278565).

Almost surely, 2^26557129 is an apocalyptic number.

It is an amenable number.

26557129 is a deficient number, since it is larger than the sum of its proper divisors (1).

26557129 is an equidigital number, since it uses as much as digits as its factorization.

26557129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 37.

The square root of 26557129 is about 5153.3609421425. The cubic root of 26557129 is about 298.3506862004.

The spelling of 26557129 in words is "twenty-six million, five hundred fifty-seven thousand, one hundred twenty-nine".