491631725 has 12 divisors (see below), whose sum is σ = 656517876. Its totient is φ = 363050880.

The previous prime is 491631671. The next prime is 491631733. The reversal of 491631725 is 527136194.

It can be written as a sum of positive squares in 6 ways, for example, as 30713764 + 460917961 = 5542^2 + 21469^2 .

It is not a de Polignac number, because 491631725 - 2²² = 487437421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 756032 + ... + 756681.

It is an arithmetic number, because the mean of its divisors is an integer number (54709823).

Almost surely, 2^491631725 is an apocalyptic number.

It is an amenable number.

491631725 is a deficient number, since it is larger than the sum of its proper divisors (164886151).

491631725 is a wasteful number, since it uses less digits than its factorization.

491631725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512736 (or 1512731 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 491631725 is about 22172.7698991353. The cubic root of 491631725 is about 789.2476547297.

The spelling of 491631725 in words is "four hundred ninety-one million, six hundred thirty-one thousand, seven hundred twenty-five".