26131505 has 4 divisors (see below), whose sum is σ = 31357812. Its totient is φ = 20905200.

The previous prime is 26131493. The next prime is 26131507. The reversal of 26131505 is 50513162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18601969 + 7529536 = 4313^2 + 2744^2 .

It is not a de Polignac number, because 26131505 - 2⁴ = 26131489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26131507) 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 in 3 ways as a sum of consecutive naturals, for example, 2613146 + ... + 2613155.

It is an arithmetic number, because the mean of its divisors is an integer number (7839453).

Almost surely, 2^26131505 is an apocalyptic number.

It is an amenable number.

26131505 is a deficient number, since it is larger than the sum of its proper divisors (5226307).

26131505 is an equidigital number, since it uses as much as digits as its factorization.

26131505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226306.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 26131505 is about 5111.8983753592. The cubic root of 26131505 is about 296.7482325624.

Adding to 26131505 its reverse (50513162), we get a palindrome (76644667).

The spelling of 26131505 in words is "twenty-six million, one hundred thirty-one thousand, five hundred five".