4815981 has 12 divisors (see below), whose sum is σ = 7365852. Its totient is φ = 3021696.

The previous prime is 4815973. The next prime is 4815989. The reversal of 4815981 is 1895184.

It is an interprime number because it is at equal distance from previous prime (4815973) and next prime (4815989).

It can be written as a sum of positive squares in 2 ways, for example, as 3481956 + 1334025 = 1866^2 + 1155^2 .

It is not a de Polignac number, because 4815981 - 2³ = 4815973 is a prime.

It is a super-2 number, since 2×4815981² = 46387345984722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4815989) 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, 15586 + ... + 15891.

It is an arithmetic number, because the mean of its divisors is an integer number (613821).

Almost surely, 2^4815981 is an apocalyptic number.

It is an amenable number.

4815981 is a deficient number, since it is larger than the sum of its proper divisors (2549871).

4815981 is a wasteful number, since it uses less digits than its factorization.

4815981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31500 (or 31497 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 4815981 is about 2194.5343469629. The cubic root of 4815981 is about 168.8735325918.

The spelling of 4815981 in words is "four million, eight hundred fifteen thousand, nine hundred eighty-one".