1491909613 has 24 divisors (see below), whose sum is σ = 1613503584. Its totient is φ = 1379040000.

The previous prime is 1491909593. The next prime is 1491909631. The reversal of 1491909613 is 3169091941.

It is not a de Polignac number, because 1491909613 - 2²¹ = 1489812461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1491909613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491909113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5943738 + ... + 5943988.

It is an arithmetic number, because the mean of its divisors is an integer number (67229316).

Almost surely, 2^1491909613 is an apocalyptic number.

It is an amenable number.

1491909613 is a deficient number, since it is larger than the sum of its proper divisors (121593971).

1491909613 is a wasteful number, since it uses less digits than its factorization.

1491909613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 1491909613 is about 38625.2457985707. The cubic root of 1491909613 is about 1142.6524910776.

The spelling of 1491909613 in words is "one billion, four hundred ninety-one million, nine hundred nine thousand, six hundred thirteen".