1491536709 has 48 divisors (see below), whose sum is σ = 2351068720. Its totient is φ = 911139840.

The previous prime is 1491536639. The next prime is 1491536719. The reversal of 1491536709 is 9076351941.

1491536709 is a `hidden beast` number, since 1 + 49 + 1 + 536 + 70 + 9 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1294920225 + 196616484 = 35985^2 + 14022^2 .

It is not a de Polignac number, because 1491536709 - 2⁹ = 1491536197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491536719) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4765137 + ... + 4765449.

Almost surely, 2^1491536709 is an apocalyptic number.

It is an amenable number.

1491536709 is a deficient number, since it is larger than the sum of its proper divisors (859532011).

1491536709 is a wasteful number, since it uses less digits than its factorization.

1491536709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 1491536709 is about 38620.4182913650. The cubic root of 1491536709 is about 1142.5572808434.

The spelling of 1491536709 in words is "one billion, four hundred ninety-one million, five hundred thirty-six thousand, seven hundred nine".