10506781 has 4 divisors (see below), whose sum is σ = 10524064. Its totient is φ = 10489500.

The previous prime is 10506767. The next prime is 10506841. The reversal of 10506781 is 18760501.

It is a happy number.

10506781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 10506781 - 2¹³ = 10498589 is a prime.

It is a super-2 number, since 2×10506781² = 220784893963922, 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 (10506281) 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, 7695 + ... + 8956.

It is an arithmetic number, because the mean of its divisors is an integer number (2631016).

Almost surely, 2^10506781 is an apocalyptic number.

It is an amenable number.

10506781 is a deficient number, since it is larger than the sum of its proper divisors (17283).

10506781 is an equidigital number, since it uses as much as digits as its factorization.

10506781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17282.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 10506781 is about 3241.4165113419. The cubic root of 10506781 is about 219.0230857700.

The spelling of 10506781 in words is "ten million, five hundred six thousand, seven hundred eighty-one".