10391261 has 4 divisors (see below), whose sum is σ = 10421052. Its totient is φ = 10361472.

The previous prime is 10391221. The next prime is 10391279. The reversal of 10391261 is 16219301.

It is a happy number.

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 7812025 + 2579236 = 2795^2 + 1606^2 .

It is a cyclic number.

It is not a de Polignac number, because 10391261 - 2¹⁴ = 10374877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10391221) 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, 14366 + ... + 15071.

It is an arithmetic number, because the mean of its divisors is an integer number (2605263).

Almost surely, 2^10391261 is an apocalyptic number.

It is an amenable number.

10391261 is a deficient number, since it is larger than the sum of its proper divisors (29791).

10391261 is an equidigital number, since it uses as much as digits as its factorization.

10391261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29790.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 10391261 is about 3223.5478901360. The cubic root of 10391261 is about 218.2174204897.

The spelling of 10391261 in words is "ten million, three hundred ninety-one thousand, two hundred sixty-one".