26013561 has 24 divisors (see below), whose sum is σ = 40558464. Its totient is φ = 14787360.

The previous prime is 26013541. The next prime is 26013569. The reversal of 26013561 is 16531062.

It is not a de Polignac number, because 26013561 - 2¹⁵ = 25980793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26013569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39511 + ... + 40163.

It is an arithmetic number, because the mean of its divisors is an integer number (1689936).

Almost surely, 2^26013561 is an apocalyptic number.

26013561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26013561 is a deficient number, since it is larger than the sum of its proper divisors (14544903).

26013561 is a wasteful number, since it uses less digits than its factorization.

26013561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 26013561 is about 5100.3491056986. The cubic root of 26013561 is about 296.3011035414.

The spelling of 26013561 in words is "twenty-six million, thirteen thousand, five hundred sixty-one".