226640891 has 4 divisors (see below), whose sum is σ = 228841392. Its totient is φ = 224440392.

The previous prime is 226640851. The next prime is 226640893. The reversal of 226640891 is 198046622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198046622 = 2 ⋅99023311.

It is a cyclic number.

It is not a de Polignac number, because 226640891 - 2²⁶ = 159532027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (226640893) 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, 1100096 + ... + 1100301.

It is an arithmetic number, because the mean of its divisors is an integer number (57210348).

Almost surely, 2^226640891 is an apocalyptic number.

226640891 is a deficient number, since it is larger than the sum of its proper divisors (2200501).

226640891 is a wasteful number, since it uses less digits than its factorization.

226640891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200500.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 226640891 is about 15054.5970055661. The cubic root of 226640891 is about 609.6951724313.

The spelling of 226640891 in words is "two hundred twenty-six million, six hundred forty thousand, eight hundred ninety-one".