18851013 has 12 divisors (see below), whose sum is σ = 27676428. Its totient is φ = 12360960.

The previous prime is 18850973. The next prime is 18851017. The reversal of 18851013 is 31015881.

It can be written as a sum of positive squares in 2 ways, for example, as 3617604 + 15233409 = 1902^2 + 3903^2 .

It is not a de Polignac number, because 18851013 - 2²¹ = 16753861 is a prime.

It is a super-2 number, since 2×18851013² = 710721382252338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18851017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16620 + ... + 17717.

It is an arithmetic number, because the mean of its divisors is an integer number (2306369).

Almost surely, 2^18851013 is an apocalyptic number.

It is an amenable number.

18851013 is a deficient number, since it is larger than the sum of its proper divisors (8825415).

18851013 is a wasteful number, since it uses less digits than its factorization.

18851013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34404 (or 34401 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 18851013 is about 4341.7753281348. The cubic root of 18851013 is about 266.1408651445.

Adding to 18851013 its reverse (31015881), we get a palindrome (49866894).

The spelling of 18851013 in words is "eighteen million, eight hundred fifty-one thousand, thirteen".