106215661 has 4 divisors (see below), whose sum is σ = 109878300. Its totient is φ = 102553024.

The previous prime is 106215647. The next prime is 106215671. The reversal of 106215661 is 166512601.

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 56160036 + 50055625 = 7494^2 + 7075^2 .

It is a cyclic number.

It is not a de Polignac number, because 106215661 - 2⁷ = 106215533 is a prime.

It is a super-2 number, since 2×106215661² = 22563533283333842, 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 (106215601) 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, 1831276 + ... + 1831333.

It is an arithmetic number, because the mean of its divisors is an integer number (27469575).

Almost surely, 2^106215661 is an apocalyptic number.

It is an amenable number.

106215661 is a deficient number, since it is larger than the sum of its proper divisors (3662639).

106215661 is an equidigital number, since it uses as much as digits as its factorization.

106215661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662638.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 106215661 is about 10306.0982432733. The cubic root of 106215661 is about 473.5830883986.

The spelling of 106215661 in words is "one hundred six million, two hundred fifteen thousand, six hundred sixty-one".