106686561 has 4 divisors (see below), whose sum is σ = 142248752. Its totient is φ = 71124372.

The previous prime is 106686557. The next prime is 106686571. The reversal of 106686561 is 165686601.

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 not a de Polignac number, because 106686561 - 2² = 106686557 is a prime.

It is a super-2 number, since 2×106686561² = 22764044596013442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106686571) 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, 17781091 + ... + 17781096.

It is an arithmetic number, because the mean of its divisors is an integer number (35562188).

Almost surely, 2^106686561 is an apocalyptic number.

It is an amenable number.

106686561 is a deficient number, since it is larger than the sum of its proper divisors (35562191).

106686561 is an equidigital number, since it uses as much as digits as its factorization.

106686561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35562190.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 106686561 is about 10328.9186752535. The cubic root of 106686561 is about 474.2819229413.

The spelling of 106686561 in words is "one hundred six million, six hundred eighty-six thousand, five hundred sixty-one".