26172561 has 8 divisors (see below), whose sum is σ = 35639424. Its totient is φ = 17077040.

The previous prime is 26172547. The next prime is 26172563. The reversal of 26172561 is 16527162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26172561 - 2⁹ = 26172049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26172563) 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 7 ways as a sum of consecutive naturals, for example, 92670 + ... + 92951.

It is an arithmetic number, because the mean of its divisors is an integer number (4454928).

Almost surely, 2^26172561 is an apocalyptic number.

It is an amenable number.

26172561 is a deficient number, since it is larger than the sum of its proper divisors (9466863).

26172561 is a wasteful number, since it uses less digits than its factorization.

26172561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185671.

The product of its digits is 5040, while the sum is 30.

The square root of 26172561 is about 5115.9125285720. The cubic root of 26172561 is about 296.9035612928.

The spelling of 26172561 in words is "twenty-six million, one hundred seventy-two thousand, five hundred sixty-one".