4992561 has 18 divisors (see below), whose sum is σ = 8389602. Its totient is φ = 2852640.

The previous prime is 4992551. The next prime is 4992569. The reversal of 4992561 is 1652994.

4992561 is a `hidden beast` number, since 4 + 9 + 92 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3186225 + 1806336 = 1785^2 + 1344^2 .

It is not a de Polignac number, because 4992561 - 2¹⁸ = 4730417 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4992569) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5220 + ... + 6101.

It is an arithmetic number, because the mean of its divisors is an integer number (466089).

Almost surely, 2^4992561 is an apocalyptic number.

It is an amenable number.

4992561 is a deficient number, since it is larger than the sum of its proper divisors (3397041).

4992561 is a wasteful number, since it uses less digits than its factorization.

4992561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11341 (or 11331 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 4992561 is about 2234.4039473649. The cubic root of 4992561 is about 170.9127491689.

The spelling of 4992561 in words is "four million, nine hundred ninety-two thousand, five hundred sixty-one".