10509661 has 2 divisors, whose sum is σ = 10509662. Its totient is φ = 10509660.

The previous prime is 10509649. The next prime is 10509677. The reversal of 10509661 is 16690501.

10509661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10201636 + 308025 = 3194^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 10509661 - 2⁷ = 10509533 is a prime.

It is a super-2 number, since 2×10509661² = 220905948669842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10509691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5254830 + 5254831.

It is an arithmetic number, because the mean of its divisors is an integer number (5254831).

Almost surely, 2^10509661 is an apocalyptic number.

It is an amenable number.

10509661 is a deficient number, since it is larger than the sum of its proper divisors (1).

10509661 is an equidigital number, since it uses as much as digits as its factorization.

10509661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 10509661 is about 3241.8607311234. The cubic root of 10509661 is about 219.0430959856.

The spelling of 10509661 in words is "ten million, five hundred nine thousand, six hundred sixty-one".