10891813 has 4 divisors (see below), whose sum is σ = 11076480. Its totient is φ = 10707148.

The previous prime is 10891799. The next prime is 10891817. The reversal of 10891813 is 31819801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10891813 - 2⁹ = 10891301 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10891817) 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, 92245 + ... + 92362.

It is an arithmetic number, because the mean of its divisors is an integer number (2769120).

Almost surely, 2^10891813 is an apocalyptic number.

It is an amenable number.

10891813 is a deficient number, since it is larger than the sum of its proper divisors (184667).

10891813 is an equidigital number, since it uses as much as digits as its factorization.

10891813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184666.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 10891813 is about 3300.2746855376. The cubic root of 10891813 is about 221.6664973209. Note that the first 3 decimals are identical.

The spelling of 10891813 in words is "ten million, eight hundred ninety-one thousand, eight hundred thirteen".