26557481 has 2 divisors, whose sum is σ = 26557482. Its totient is φ = 26557480.

The previous prime is 26557471. The next prime is 26557501. The reversal of 26557481 is 18475562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22477081 + 4080400 = 4741^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 26557481 - 2¹⁸ = 26295337 is a prime.

It is a super-2 number, since 2×26557481² = 1410599594130722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26557471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13278740 + 13278741.

It is an arithmetic number, because the mean of its divisors is an integer number (13278741).

Almost surely, 2^26557481 is an apocalyptic number.

It is an amenable number.

26557481 is a deficient number, since it is larger than the sum of its proper divisors (1).

26557481 is an equidigital number, since it uses as much as digits as its factorization.

26557481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 38.

The square root of 26557481 is about 5153.3950944984. The cubic root of 26557481 is about 298.3520043522.

The spelling of 26557481 in words is "twenty-six million, five hundred fifty-seven thousand, four hundred eighty-one".