4451981 has 4 divisors (see below), whose sum is σ = 4546752. Its totient is φ = 4357212.

The previous prime is 4451957. The next prime is 4451983. The reversal of 4451981 is 1891544.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4451981 is a prime.

It is a super-2 number, since 2×4451981² = 39640269648722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4451983) 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 3 ways as a sum of consecutive naturals, for example, 47315 + ... + 47408.

It is an arithmetic number, because the mean of its divisors is an integer number (1136688).

Almost surely, 2^4451981 is an apocalyptic number.

It is an amenable number.

4451981 is a deficient number, since it is larger than the sum of its proper divisors (94771).

4451981 is an equidigital number, since it uses as much as digits as its factorization.

4451981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94770.

The product of its digits is 5760, while the sum is 32.

The square root of 4451981 is about 2109.9718007594. The cubic root of 4451981 is about 164.5070195297.

It can be divided in two parts, 44 and 51981, that added together give a palindrome (52025).

The spelling of 4451981 in words is "four million, four hundred fifty-one thousand, nine hundred eighty-one".