106840781 has 4 divisors (see below), whose sum is σ = 112464000. Its totient is φ = 101217564.

The previous prime is 106840771. The next prime is 106840807. The reversal of 106840781 is 187048601.

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: 187048601 = 41 ⋅4562161.

It is a cyclic number.

It is not a de Polignac number, because 106840781 - 2²² = 102646477 is a prime.

It is a super-2 number, since 2×106840781² = 22829904969379922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106840771) 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, 2811581 + ... + 2811618.

It is an arithmetic number, because the mean of its divisors is an integer number (28116000).

Almost surely, 2^106840781 is an apocalyptic number.

It is an amenable number.

106840781 is a deficient number, since it is larger than the sum of its proper divisors (5623219).

106840781 is an equidigital number, since it uses as much as digits as its factorization.

106840781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5623218.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 106840781 is about 10336.3814267857. The cubic root of 106840781 is about 474.5103445331.

The spelling of 106840781 in words is "one hundred six million, eight hundred forty thousand, seven hundred eighty-one".