105721573 has 4 divisors (see below), whose sum is σ = 106114860. Its totient is φ = 105328288.

The previous prime is 105721537. The next prime is 105721579. The reversal of 105721573 is 375127501.

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 3751969 + 101969604 = 1937^2 + 10098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105721573 is a prime.

It is a super-2 number, since 2×105721573² = 22354101995188658, 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 (105721579) 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, 196240 + ... + 196777.

It is an arithmetic number, because the mean of its divisors is an integer number (26528715).

Almost surely, 2^105721573 is an apocalyptic number.

It is an amenable number.

105721573 is a deficient number, since it is larger than the sum of its proper divisors (393287).

105721573 is an equidigital number, since it uses as much as digits as its factorization.

105721573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393286.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 105721573 is about 10282.0996396650. The cubic root of 105721573 is about 472.8476178083.

The spelling of 105721573 in words is "one hundred five million, seven hundred twenty-one thousand, five hundred seventy-three".