107921813 has 4 divisors (see below), whose sum is σ = 109400268. Its totient is φ = 106443360.

The previous prime is 107921783. The next prime is 107921837. The reversal of 107921813 is 318129701.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27227524 + 80694289 = 5218^2 + 8983^2 .

It is a cyclic number.

It is not a de Polignac number, because 107921813 - 2¹⁴ = 107905429 is a prime.

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 107921813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (107921113) 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, 739118 + ... + 739263.

It is an arithmetic number, because the mean of its divisors is an integer number (27350067).

Almost surely, 2^107921813 is an apocalyptic number.

It is an amenable number.

107921813 is a deficient number, since it is larger than the sum of its proper divisors (1478455).

107921813 is an equidigital number, since it uses as much as digits as its factorization.

107921813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478454.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 107921813 is about 10388.5423905378. The cubic root of 107921813 is about 476.1053673598.

The spelling of 107921813 in words is "one hundred seven million, nine hundred twenty-one thousand, eight hundred thirteen".