487691581 has 18 divisors (see below), whose sum is σ = 537842490. Its totient is φ = 442012896.

The previous prime is 487691549. The next prime is 487691587. The reversal of 487691581 is 185196784.

It can be written as a sum of positive squares in 3 ways, for example, as 783225 + 486908356 = 885^2 + 22066^2 .

It is not a de Polignac number, because 487691581 - 2⁵ = 487691549 is a prime.

It is a super-2 number, since 2×487691581² = 475686156356559122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (487691587) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 587875 + ... + 588703.

Almost surely, 2^487691581 is an apocalyptic number.

It is an amenable number.

487691581 is a deficient number, since it is larger than the sum of its proper divisors (50150909).

487691581 is an equidigital number, since it uses as much as digits as its factorization.

487691581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973 (or 901 counting only the distinct ones).

The product of its digits is 483840, while the sum is 49.

The square root of 487691581 is about 22083.7401949941. The cubic root of 487691581 is about 787.1335423055.

The spelling of 487691581 in words is "four hundred eighty-seven million, six hundred ninety-one thousand, five hundred eighty-one".