491580737 has 4 divisors (see below), whose sum is σ = 491625156. Its totient is φ = 491536320.

The previous prime is 491580703. The next prime is 491580757. The reversal of 491580737 is 737085194.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 737085194 = 2 ⋅368542597.

It can be written as a sum of positive squares in 2 ways, for example, as 371371441 + 120209296 = 19271^2 + 10964^2 .

It is a cyclic number.

It is not a de Polignac number, because 491580737 - 2¹⁸ = 491318593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491580757) 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, 9173 + ... + 32669.

It is an arithmetic number, because the mean of its divisors is an integer number (122906289).

Almost surely, 2^491580737 is an apocalyptic number.

It is an amenable number.

491580737 is a deficient number, since it is larger than the sum of its proper divisors (44419).

491580737 is a wasteful number, since it uses less digits than its factorization.

491580737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44418.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 491580737 is about 22171.6200806346. The cubic root of 491580737 is about 789.2203690274.

The spelling of 491580737 in words is "four hundred ninety-one million, five hundred eighty thousand, seven hundred thirty-seven".