491087437 has 2 divisors, whose sum is σ = 491087438. Its totient is φ = 491087436.

The previous prime is 491087423. The next prime is 491087473. The reversal of 491087437 is 734780194.

Together with next prime (491087473) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394379881 + 96707556 = 19859^2 + 9834^2 .

It is a cyclic number.

It is not a de Polignac number, because 491087437 - 2¹¹ = 491085389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491087393 and 491087402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491087497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245543718 + 245543719.

It is an arithmetic number, because the mean of its divisors is an integer number (245543719).

Almost surely, 2^491087437 is an apocalyptic number.

It is an amenable number.

491087437 is a deficient number, since it is larger than the sum of its proper divisors (1).

491087437 is an equidigital number, since it uses as much as digits as its factorization.

491087437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 491087437 is about 22160.4927066164. The cubic root of 491087437 is about 788.9562871385.

The spelling of 491087437 in words is "four hundred ninety-one million, eighty-seven thousand, four hundred thirty-seven".