4491289057 has 4 divisors (see below), whose sum is σ = 4491552276. Its totient is φ = 4491025840.

The previous prime is 4491289043. The next prime is 4491289063. The reversal of 4491289057 is 7509821944.

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 2709098401 + 1782190656 = 52049^2 + 42216^2 .

It is a cyclic number.

It is not a de Polignac number, because 4491289057 - 2⁷ = 4491288929 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4491289057.

It is not an unprimeable number, because it can be changed into a prime (4491289657) 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, 104098 + ... + 140779.

It is an arithmetic number, because the mean of its divisors is an integer number (1122888069).

Almost surely, 2^4491289057 is an apocalyptic number.

It is an amenable number.

4491289057 is a deficient number, since it is larger than the sum of its proper divisors (263219).

4491289057 is a wasteful number, since it uses less digits than its factorization.

4491289057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263218.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 4491289057 is about 67017.0803377766. The cubic root of 4491289057 is about 1649.8976437271.

The spelling of 4491289057 in words is "four billion, four hundred ninety-one million, two hundred eighty-nine thousand, fifty-seven".