26031561 has 24 divisors (see below), whose sum is σ = 37161600. Its totient is φ = 16200096.

The previous prime is 26031553. The next prime is 26031563. The reversal of 26031561 is 16513062.

It is not a de Polignac number, because 26031561 - 2³ = 26031553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26031563) 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 23 ways as a sum of consecutive naturals, for example, 74415 + ... + 74763.

It is an arithmetic number, because the mean of its divisors is an integer number (1548400).

Almost surely, 2^26031561 is an apocalyptic number.

It is an amenable number.

26031561 is a deficient number, since it is larger than the sum of its proper divisors (11130039).

26031561 is a wasteful number, since it uses less digits than its factorization.

26031561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 422 counting only the distinct ones).

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

The square root of 26031561 is about 5102.1133856472. The cubic root of 26031561 is about 296.3694293169.

The spelling of 26031561 in words is "twenty-six million, thirty-one thousand, five hundred sixty-one".