10391281 has 4 divisors (see below), whose sum is σ = 10431972. Its totient is φ = 10350592.

The previous prime is 10391279. The next prime is 10391299. The reversal of 10391281 is 18219301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18219301 = 2647 ⋅6883.

It can be written as a sum of positive squares in 2 ways, for example, as 6553600 + 3837681 = 2560^2 + 1959^2 .

It is a cyclic number.

It is not a de Polignac number, because 10391281 - 2¹ = 10391279 is a prime.

It is a super-2 number, since 2×10391281² = 215957441641922, which contains 22 as substring.

It is a Duffinian 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, 19960 + ... + 20473.

It is an arithmetic number, because the mean of its divisors is an integer number (2607993).

Almost surely, 2^10391281 is an apocalyptic number.

It is an amenable number.

10391281 is a deficient number, since it is larger than the sum of its proper divisors (40691).

10391281 is an equidigital number, since it uses as much as digits as its factorization.

10391281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40690.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 10391281 is about 3223.5509923065. The cubic root of 10391281 is about 218.2175604902.

The spelling of 10391281 in words is "ten million, three hundred ninety-one thousand, two hundred eighty-one".