26481557 has 2 divisors, whose sum is σ = 26481558. Its totient is φ = 26481556.

The previous prime is 26481551. The next prime is 26481569. The reversal of 26481557 is 75518462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23902321 + 2579236 = 4889^2 + 1606^2 .

It is a cyclic number.

It is not a de Polignac number, because 26481557 - 2⁴ = 26481541 is a prime.

It is a super-2 number, since 2×26481557² = 1402545722288498, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26481557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26481551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13240778 + 13240779.

It is an arithmetic number, because the mean of its divisors is an integer number (13240779).

Almost surely, 2^26481557 is an apocalyptic number.

It is an amenable number.

26481557 is a deficient number, since it is larger than the sum of its proper divisors (1).

26481557 is an equidigital number, since it uses as much as digits as its factorization.

26481557 is an odious number, because the sum of its binary digits is odd.

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

The square root of 26481557 is about 5146.0234161924. The cubic root of 26481557 is about 298.0674178952.

The spelling of 26481557 in words is "twenty-six million, four hundred eighty-one thousand, five hundred fifty-seven".