26115551 has 16 divisors (see below), whose sum is σ = 32840448. Its totient is φ = 20342520.

The previous prime is 26115541. The next prime is 26115581. The reversal of 26115551 is 15551162.

It is not a de Polignac number, because 26115551 - 2⁶ = 26115487 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26115551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26115541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7916 + ... + 10718.

It is an arithmetic number, because the mean of its divisors is an integer number (2052528).

Almost surely, 2^26115551 is an apocalyptic number.

26115551 is a deficient number, since it is larger than the sum of its proper divisors (6724897).

26115551 is an equidigital number, since it uses as much as digits as its factorization.

26115551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2843 (or 2821 counting only the distinct ones).

The product of its digits is 1500, while the sum is 26.

The square root of 26115551 is about 5110.3376600769. The cubic root of 26115551 is about 296.6878292917.

The spelling of 26115551 in words is "twenty-six million, one hundred fifteen thousand, five hundred fifty-one".