105925721 has 4 divisors (see below), whose sum is σ = 115555344. Its totient is φ = 96296100.

The previous prime is 105925717. The next prime is 105925723. The reversal of 105925721 is 127529501.

It is a happy number.

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 105925721 - 2² = 105925717 is a prime.

It is a super-2 number, since 2×105925721² = 22440516738739682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (105925723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4814795 + ... + 4814816.

It is an arithmetic number, because the mean of its divisors is an integer number (28888836).

Almost surely, 2^105925721 is an apocalyptic number.

105925721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

105925721 is a deficient number, since it is larger than the sum of its proper divisors (9629623).

105925721 is an equidigital number, since it uses as much as digits as its factorization.

105925721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9629622.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 105925721 is about 10292.0222016861. The cubic root of 105925721 is about 473.1517778320.

The spelling of 105925721 in words is "one hundred five million, nine hundred twenty-five thousand, seven hundred twenty-one".