10640261 has 4 divisors (see below), whose sum is σ = 10786092. Its totient is φ = 10494432.

The previous prime is 10640257. The next prime is 10640263. The reversal of 10640261 is 16204601.

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: 16204601 = 7 ⋅2314943.

It can be written as a sum of positive squares in 2 ways, for example, as 8375236 + 2265025 = 2894^2 + 1505^2 .

It is a cyclic number.

It is not a de Polignac number, because 10640261 - 2² = 10640257 is a prime.

It is a super-2 number, since 2×10640261² = 226430308296242, 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 (10640263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72806 + ... + 72951.

It is an arithmetic number, because the mean of its divisors is an integer number (2696523).

Almost surely, 2^10640261 is an apocalyptic number.

It is an amenable number.

10640261 is a deficient number, since it is larger than the sum of its proper divisors (145831).

10640261 is an equidigital number, since it uses as much as digits as its factorization.

10640261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145830.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 10640261 is about 3261.9412931566. The cubic root of 10640261 is about 219.9466881841.

Adding to 10640261 its reverse (16204601), we get a palindrome (26844862).

It can be divided in two parts, 10640 and 261, that added together give a palindrome (10901).

The spelling of 10640261 in words is "ten million, six hundred forty thousand, two hundred sixty-one".