10181813 has 4 divisors (see below), whose sum is σ = 10532940. Its totient is φ = 9830688.

The previous prime is 10181803. The next prime is 10181837. The reversal of 10181813 is 31818101.

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 6770404 + 3411409 = 2602^2 + 1847^2 .

It is a cyclic number.

It is not a de Polignac number, because 10181813 - 2⁴ = 10181797 is a prime.

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 (10181803) 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, 175520 + ... + 175577.

It is an arithmetic number, because the mean of its divisors is an integer number (2633235).

Almost surely, 2^10181813 is an apocalyptic number.

It is an amenable number.

10181813 is a deficient number, since it is larger than the sum of its proper divisors (351127).

10181813 is an equidigital number, since it uses as much as digits as its factorization.

10181813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351126.

The product of its (nonzero) digits is 192, while the sum is 23.

The square root of 10181813 is about 3190.8953289007. The cubic root of 10181813 is about 216.7413157637.

Adding to 10181813 its reverse (31818101), we get a palindrome (41999914).

The spelling of 10181813 in words is "ten million, one hundred eighty-one thousand, eight hundred thirteen".