491287225 has 81 divisors (see below), whose sum is σ = 749227437. Its totient is φ = 319176000.

The previous prime is 491287217. The next prime is 491287241. The reversal of 491287225 is 522782194.

The square root of 491287225 is 22165.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 126630009 + 364657216 = 11253^2 + 19096^2 .

It is not a de Polignac number, because 491287225 - 2³ = 491287217 is a prime.

Its product of digits (80640) is a multiple of the sum of its prime divisors (60).

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 15847960 + ... + 15847990.

Almost surely, 2^491287225 is an apocalyptic number.

491287225 is the 22165-th square number.

491287225 is the 11083-rd centered octagonal number.

It is an amenable number.

491287225 is a deficient number, since it is larger than the sum of its proper divisors (257940212).

491287225 is a wasteful number, since it uses less digits than its factorization.

491287225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 60 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The cubic root of 491287225 is about 789.0632624049.

The spelling of 491287225 in words is "four hundred ninety-one million, two hundred eighty-seven thousand, two hundred twenty-five".