4990561 has 4 divisors (see below), whose sum is σ = 5112324. Its totient is φ = 4868800.

The previous prime is 4990547. The next prime is 4990567. The reversal of 4990561 is 1650994.

4990561 is nontrivially palindromic in base 12.

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 1089936 + 3900625 = 1044^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 4990561 - 2⁵ = 4990529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4990567) 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, 60820 + ... + 60901.

It is an arithmetic number, because the mean of its divisors is an integer number (1278081).

Almost surely, 2^4990561 is an apocalyptic number.

4990561 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4990561 is a deficient number, since it is larger than the sum of its proper divisors (121763).

4990561 is a wasteful number, since it uses less digits than its factorization.

4990561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121762.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 4990561 is about 2233.9563558852. The cubic root of 4990561 is about 170.8899237991.

The spelling of 4990561 in words is "four million, nine hundred ninety thousand, five hundred sixty-one".