26215291 has 4 divisors (see below), whose sum is σ = 26606632. Its totient is φ = 25823952.

The previous prime is 26215289. The next prime is 26215339. The reversal of 26215291 is 19251262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19251262 = 2 ⋅9625631.

It is a cyclic number.

It is not a de Polignac number, because 26215291 - 2¹ = 26215289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26215271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195570 + ... + 195703.

It is an arithmetic number, because the mean of its divisors is an integer number (6651658).

Almost surely, 2^26215291 is an apocalyptic number.

26215291 is a deficient number, since it is larger than the sum of its proper divisors (391341).

26215291 is an equidigital number, since it uses as much as digits as its factorization.

26215291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391340.

The product of its digits is 2160, while the sum is 28.

The square root of 26215291 is about 5120.0870109794. The cubic root of 26215291 is about 297.0650509183.

It can be divided in two parts, 262152 and 91, that multiplied together give a palindrome (23855832).

The spelling of 26215291 in words is "twenty-six million, two hundred fifteen thousand, two hundred ninety-one".