106551209 has 4 divisors (see below), whose sum is σ = 108818304. Its totient is φ = 104284116.

The previous prime is 106551199. The next prime is 106551271. The reversal of 106551209 is 902155601.

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, and also an emirpimes, since its reverse is a distinct semiprime: 902155601 = 2477 ⋅364213.

It is a cyclic number.

It is not a de Polignac number, because 106551209 - 2⁸ = 106550953 is a prime.

It is a super-2 number, since 2×106551209² = 22706320278723362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106541209) 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, 1133477 + ... + 1133570.

It is an arithmetic number, because the mean of its divisors is an integer number (27204576).

Almost surely, 2^106551209 is an apocalyptic number.

It is an amenable number.

106551209 is a deficient number, since it is larger than the sum of its proper divisors (2267095).

106551209 is an equidigital number, since it uses as much as digits as its factorization.

106551209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267094.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 106551209 is about 10322.3645062553. The cubic root of 106551209 is about 474.0812660725.

The spelling of 106551209 in words is "one hundred six million, five hundred fifty-one thousand, two hundred nine".