26291213 has 4 divisors (see below), whose sum is σ = 28313628. Its totient is φ = 24268800.

The previous prime is 26291207. The next prime is 26291227. The reversal of 26291213 is 31219262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31219262 = 2 ⋅15609631.

It can be written as a sum of positive squares in 2 ways, for example, as 5697769 + 20593444 = 2387^2 + 4538^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26291213 is a prime.

It is a super-2 number, since 2×26291213² = 1382455762022738, 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 (26291263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011188 + ... + 1011213.

It is an arithmetic number, because the mean of its divisors is an integer number (7078407).

Almost surely, 2^26291213 is an apocalyptic number.

It is an amenable number.

26291213 is a deficient number, since it is larger than the sum of its proper divisors (2022415).

26291213 is a wasteful number, since it uses less digits than its factorization.

26291213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022414.

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

The square root of 26291213 is about 5127.4957825434. The cubic root of 26291213 is about 297.3515508231.

The spelling of 26291213 in words is "twenty-six million, two hundred ninety-one thousand, two hundred thirteen".