106638505 has 4 divisors (see below), whose sum is σ = 127966212. Its totient is φ = 85310800.

The previous prime is 106638487. The next prime is 106638509. The reversal of 106638505 is 505836601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505836601 = 19 ⋅26622979.

It can be written as a sum of positive squares in 2 ways, for example, as 60886809 + 45751696 = 7803^2 + 6764^2 .

It is not a de Polignac number, because 106638505 - 2¹¹ = 106636457 is a prime.

It is a super-2 number, since 2×106638505² = 22743541497270050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106638509) 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, 10663846 + ... + 10663855.

It is an arithmetic number, because the mean of its divisors is an integer number (31991553).

Almost surely, 2^106638505 is an apocalyptic number.

It is an amenable number.

106638505 is a deficient number, since it is larger than the sum of its proper divisors (21327707).

106638505 is an equidigital number, since it uses as much as digits as its factorization.

106638505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21327706.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 106638505 is about 10326.5921290617. The cubic root of 106638505 is about 474.2107002403.

It can be divided in two parts, 1066 and 38505, that multiplied together give a triangular number (41046330 = T₉₀₆₀).

The spelling of 106638505 in words is "one hundred six million, six hundred thirty-eight thousand, five hundred five".