4999561 has 4 divisors (see below), whose sum is σ = 5713792. Its totient is φ = 4285332.

The previous prime is 4999559. The next prime is 4999591. The reversal of 4999561 is 1659994.

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 not a de Polignac number, because 4999561 - 2¹ = 4999559 is a prime.

It is a super-2 number, since 2×4999561² = 49991220385442, which contains 22 as substring.

4999561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4999591) 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, 357105 + ... + 357118.

It is an arithmetic number, because the mean of its divisors is an integer number (1428448).

Almost surely, 2^4999561 is an apocalyptic number.

It is an amenable number.

4999561 is a deficient number, since it is larger than the sum of its proper divisors (714231).

4999561 is an equidigital number, since it uses as much as digits as its factorization.

4999561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714230.

The product of its digits is 87480, while the sum is 43.

The square root of 4999561 is about 2235.9698119608. The cubic root of 4999561 is about 170.9925899916.

The spelling of 4999561 in words is "four million, nine hundred ninety-nine thousand, five hundred sixty-one".