10691261 has 12 divisors (see below), whose sum is σ = 12775068. Its totient is φ = 8914752.

The previous prime is 10691237. The next prime is 10691267. The reversal of 10691261 is 16219601.

10691261 = 343² + 344² + ... + 416².

10691261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 9703225 + 988036 = 3115^2 + 994^2 .

It is a de Polignac number, because none of the positive numbers 2^k-10691261 is a prime.

It is a super-2 number, since 2×10691261² = 228606123540242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10691261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10691267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1136 + ... + 4761.

It is an arithmetic number, because the mean of its divisors is an integer number (1064589).

Almost surely, 2^10691261 is an apocalyptic number.

It is an amenable number.

10691261 is a deficient number, since it is larger than the sum of its proper divisors (2083807).

10691261 is an equidigital number, since it uses as much as digits as its factorization.

10691261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5948 (or 5941 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 10691261 is about 3269.7493787751. The cubic root of 10691261 is about 220.2975381855.

The spelling of 10691261 in words is "ten million, six hundred ninety-one thousand, two hundred sixty-one".