1687584049 has 4 divisors (see below), whose sum is σ = 1687832100. Its totient is φ = 1687336000.

The previous prime is 1687584043. The next prime is 1687584109. The reversal of 1687584049 is 9404857861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 275327649 + 1412256400 = 16593^2 + 37580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687584049 - 2⁹ = 1687583537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1687583987 and 1687584005.

It is not an unprimeable number, because it can be changed into a prime (1687584043) 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, 113524 + ... + 127525.

It is an arithmetic number, because the mean of its divisors is an integer number (421958025).

Almost surely, 2^1687584049 is an apocalyptic number.

It is an amenable number.

1687584049 is a deficient number, since it is larger than the sum of its proper divisors (248051).

1687584049 is an equidigital number, since it uses as much as digits as its factorization.

1687584049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248050.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The square root of 1687584049 is about 41080.2148119992. The cubic root of 1687584049 is about 1190.5705544956.

The spelling of 1687584049 in words is "one billion, six hundred eighty-seven million, five hundred eighty-four thousand, forty-nine".