1585132487 has 4 divisors (see below), whose sum is σ = 1586373120. Its totient is φ = 1583891856.

The previous prime is 1585132421. The next prime is 1585132499. The reversal of 1585132487 is 7842315851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7842315851 = 7583 ⋅1034197.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1585132487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1585137487) 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, 618398 + ... + 620955.

It is an arithmetic number, because the mean of its divisors is an integer number (396593280).

Almost surely, 2^1585132487 is an apocalyptic number.

1585132487 is a deficient number, since it is larger than the sum of its proper divisors (1240633).

1585132487 is a wasteful number, since it uses less digits than its factorization.

1585132487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240632.

The product of its digits is 268800, while the sum is 44.

The square root of 1585132487 is about 39813.7223454427. The cubic root of 1585132487 is about 1165.9730766183.

The spelling of 1585132487 in words is "one billion, five hundred eighty-five million, one hundred thirty-two thousand, four hundred eighty-seven".