10069781 has 4 divisors (see below), whose sum is σ = 10106412. Its totient is φ = 10033152.

The previous prime is 10069771. The next prime is 10069793. The reversal of 10069781 is 18796001.

10069781 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 2280100 + 7789681 = 1510^2 + 2791^2 .

It is a cyclic number.

It is not a de Polignac number, because 10069781 - 2¹⁰ = 10068757 is a prime.

It is a super-2 number, since 2×10069781² = 202800978775922, 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 (10069721) 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, 17900 + ... + 18453.

It is an arithmetic number, because the mean of its divisors is an integer number (2526603).

Almost surely, 2^10069781 is an apocalyptic number.

It is an amenable number.

10069781 is a deficient number, since it is larger than the sum of its proper divisors (36631).

10069781 is an equidigital number, since it uses as much as digits as its factorization.

10069781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36630.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 10069781 is about 3173.2918239582. The cubic root of 10069781 is about 215.9434365495.

The spelling of 10069781 in words is "ten million, sixty-nine thousand, seven hundred eighty-one".