109481821 has 4 divisors (see below), whose sum is σ = 110269600. Its totient is φ = 108694044.

The previous prime is 109481797. The next prime is 109481831. The reversal of 109481821 is 128184901.

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 a de Polignac number, because none of the positive numbers 2^k-109481821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109481831) 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, 393681 + ... + 393958.

It is an arithmetic number, because the mean of its divisors is an integer number (27567400).

Almost surely, 2^109481821 is an apocalyptic number.

It is an amenable number.

109481821 is a deficient number, since it is larger than the sum of its proper divisors (787779).

109481821 is an equidigital number, since it uses as much as digits as its factorization.

109481821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787778.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 109481821 is about 10463.3561059538. The cubic root of 109481821 is about 478.3884335862.

It can be divided in two parts, 10948 and 1821, that added together give a square (12769 = 113²).

The spelling of 109481821 in words is "one hundred nine million, four hundred eighty-one thousand, eight hundred twenty-one".