26215231 has 16 divisors (see below), whose sum is σ = 32140800. Its totient is φ = 20880288.

The previous prime is 26215229. The next prime is 26215247. The reversal of 26215231 is 13251262.

It is a cyclic number.

It is not a de Polignac number, because 26215231 - 2¹ = 26215229 is a prime.

It is a super-2 number, since 2×26215231² = 1374476672766722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 5190 + ... + 8908.

It is an arithmetic number, because the mean of its divisors is an integer number (2008800).

Almost surely, 2^26215231 is an apocalyptic number.

26215231 is a deficient number, since it is larger than the sum of its proper divisors (5925569).

26215231 is a wasteful number, since it uses less digits than its factorization.

26215231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3798.

The product of its digits is 720, while the sum is 22.

The square root of 26215231 is about 5120.0811517006. The cubic root of 26215231 is about 297.0648242832.

Adding to 26215231 its reverse (13251262), we get a palindrome (39466493).

The spelling of 26215231 in words is "twenty-six million, two hundred fifteen thousand, two hundred thirty-one".