26113509 has 28 divisors (see below), whose sum is σ = 39623436. Its totient is φ = 17200512.

The previous prime is 26113489. The next prime is 26113511. The reversal of 26113509 is 90531162.

It can be written as a sum of positive squares in 2 ways, for example, as 893025 + 25220484 = 945^2 + 5022^2 .

It is not a de Polignac number, because 26113509 - 2²¹ = 24016357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26113519) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 82219 + ... + 82535.

Almost surely, 2^26113509 is an apocalyptic number.

It is an amenable number.

26113509 is a deficient number, since it is larger than the sum of its proper divisors (13509927).

26113509 is an equidigital number, since it uses as much as digits as its factorization.

26113509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 26113509 is about 5110.1378650678. The cubic root of 26113509 is about 296.6800963215.

The spelling of 26113509 in words is "twenty-six million, one hundred thirteen thousand, five hundred nine".