10116581 has 4 divisors (see below), whose sum is σ = 10711692. Its totient is φ = 9521472.

The previous prime is 10116539. The next prime is 10116593. The reversal of 10116581 is 18561101.

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 7022500 + 3094081 = 2650^2 + 1759^2 .

It is a cyclic number.

It is not a de Polignac number, because 10116581 - 2⁶ = 10116517 is a prime.

It is a super-2 number, since 2×10116581² = 204690422259122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10116781) 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, 297530 + ... + 297563.

It is an arithmetic number, because the mean of its divisors is an integer number (2677923).

Almost surely, 2^10116581 is an apocalyptic number.

It is an amenable number.

10116581 is a deficient number, since it is larger than the sum of its proper divisors (595111).

10116581 is an equidigital number, since it uses as much as digits as its factorization.

10116581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595110.

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 10116581 is about 3180.6573220012. The cubic root of 10116581 is about 216.2774569478.

Adding to 10116581 its reverse (18561101), we get a palindrome (28677682).

The spelling of 10116581 in words is "ten million, one hundred sixteen thousand, five hundred eighty-one".