4481615981 has 2 divisors, whose sum is σ = 4481615982. Its totient is φ = 4481615980.

The previous prime is 4481615953. The next prime is 4481615989. The reversal of 4481615981 is 1895161844.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3765785956 + 715830025 = 61366^2 + 26755^2 .

It is a cyclic number.

It is not a de Polignac number, because 4481615981 - 2²⁶ = 4414507117 is a prime.

It is a super-2 number, since 2×4481615981² = 40169763602309184722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4481615989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2240807990 + 2240807991.

It is an arithmetic number, because the mean of its divisors is an integer number (2240807991).

Almost surely, 2^4481615981 is an apocalyptic number.

It is an amenable number.

4481615981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4481615981 is an equidigital number, since it uses as much as digits as its factorization.

4481615981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 47.

The square root of 4481615981 is about 66944.8727013503. The cubic root of 4481615981 is about 1648.7123079631.

The spelling of 4481615981 in words is "four billion, four hundred eighty-one million, six hundred fifteen thousand, nine hundred eighty-one".