26291231 has 16 divisors (see below), whose sum is σ = 30585600. Its totient is φ = 22416768.

The previous prime is 26291227. The next prime is 26291263. The reversal of 26291231 is 13219262.

It is a cyclic number.

It is not a de Polignac number, because 26291231 - 2² = 26291227 is a prime.

It is a super-2 number, since 2×26291231² = 1382457654990722, which contains 22 as substring.

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 26291231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26291281) 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, 5660 + ... + 9198.

It is an arithmetic number, because the mean of its divisors is an integer number (1911600).

Almost surely, 2^26291231 is an apocalyptic number.

26291231 is a deficient number, since it is larger than the sum of its proper divisors (4294369).

26291231 is a wasteful number, since it uses less digits than its factorization.

26291231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3598.

The product of its digits is 1296, while the sum is 26.

The square root of 26291231 is about 5127.4975377859. The cubic root of 26291231 is about 297.3516186826.

The spelling of 26291231 in words is "twenty-six million, two hundred ninety-one thousand, two hundred thirty-one".