4991625 has 80 divisors (see below), whose sum is σ = 10193040. Its totient is φ = 2419200.

The previous prime is 4991617. The next prime is 4991647. The reversal of 4991625 is 5261994.

4991625 is a `hidden beast` number, since 499 + 162 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 927369 + 4064256 = 963^2 + 2016^2 .

It is not a de Polignac number, because 4991625 - 2³ = 4991617 is a prime.

It is an Ulam number.

Its product of digits (19440) is a multiple of the sum of its prime divisors (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4991625.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 172111 + ... + 172139.

It is an arithmetic number, because the mean of its divisors is an integer number (127413).

Almost surely, 2^4991625 is an apocalyptic number.

4991625 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4991625 is an abundant number, since it is smaller than the sum of its proper divisors (5201415).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4991625 is a wasteful number, since it uses less digits than its factorization.

4991625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 54 counting only the distinct ones).

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

The square root of 4991625 is about 2234.1944857152. The cubic root of 4991625 is about 170.9020676549.

The spelling of 4991625 in words is "four million, nine hundred ninety-one thousand, six hundred twenty-five".