1580539491 has 36 divisors (see below), whose sum is σ = 2435607720. Its totient is φ = 984934080.

The previous prime is 1580539481. The next prime is 1580539537. The reversal of 1580539491 is 1949350851.

1580539491 is a `hidden beast` number, since 158 + 0 + 5 + 3 + 9 + 491 = 666.

It is not a de Polignac number, because 1580539491 - 2¹¹ = 1580537443 is a prime.

It is a super-2 number, since 2×1580539491² = 4996210165221078162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1580539421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1066471 + ... + 1067951.

It is an arithmetic number, because the mean of its divisors is an integer number (67655770).

Almost surely, 2^1580539491 is an apocalyptic number.

1580539491 is a deficient number, since it is larger than the sum of its proper divisors (855068229).

1580539491 is a wasteful number, since it uses less digits than its factorization.

1580539491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 1580539491 is about 39755.9994340477. Note that the first 3 decimals coincide. The cubic root of 1580539491 is about 1164.8458332103.

Adding to 1580539491 its sum of digits (45), we get a square (1580539536 = 39756²).

The spelling of 1580539491 in words is "one billion, five hundred eighty million, five hundred thirty-nine thousand, four hundred ninety-one".