106987865 has 4 divisors (see below), whose sum is σ = 128385444. Its totient is φ = 85590288.

The previous prime is 106987849. The next prime is 106987877. The reversal of 106987865 is 568789601.

Added to its reverse (568789601) it gives a triangular number (675777466 = T₃₆₇₆₃).

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568789601 = 10949 ⋅51949.

It can be written as a sum of positive squares in 2 ways, for example, as 22733824 + 84254041 = 4768^2 + 9179^2 .

It is a cyclic number.

It is not a de Polignac number, because 106987865 - 2⁴ = 106987849 is a prime.

It is a super-2 number, since 2×106987865² = 22892806514516450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10698782 + ... + 10698791.

It is an arithmetic number, because the mean of its divisors is an integer number (32096361).

Almost surely, 2^106987865 is an apocalyptic number.

It is an amenable number.

106987865 is a deficient number, since it is larger than the sum of its proper divisors (21397579).

106987865 is an equidigital number, since it uses as much as digits as its factorization.

106987865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21397578.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 106987865 is about 10343.4938487921. The cubic root of 106987865 is about 474.7279920025.

Adding to 106987865 its reverse (568789601), we get a triangular number (675777466 = T₃₆₇₆₃).

The spelling of 106987865 in words is "one hundred six million, nine hundred eighty-seven thousand, eight hundred sixty-five".