106565621 has 4 divisors (see below), whose sum is σ = 107008044. Its totient is φ = 106123200.

The previous prime is 106565617. The next prime is 106565629. The reversal of 106565621 is 126565601.

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 53129521 + 53436100 = 7289^2 + 7310^2 .

It is a cyclic number.

It is not a de Polignac number, because 106565621 - 2² = 106565617 is a prime.

It is a super-2 number, since 2×106565621² = 22712463158231282, 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 (106565629) 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, 220850 + ... + 221331.

It is an arithmetic number, because the mean of its divisors is an integer number (26752011).

Almost surely, 2^106565621 is an apocalyptic number.

It is an amenable number.

106565621 is a deficient number, since it is larger than the sum of its proper divisors (442423).

106565621 is an equidigital number, since it uses as much as digits as its factorization.

106565621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442422.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 106565621 is about 10323.0625785181. The cubic root of 106565621 is about 474.1026396801.

The spelling of 106565621 in words is "one hundred six million, five hundred sixty-five thousand, six hundred twenty-one".