1491309036 has 96 divisors (see below), whose sum is σ = 4462671360. Its totient is φ = 421848000.

The previous prime is 1491309019. The next prime is 1491309059. The reversal of 1491309036 is 6309031941.

1491309036 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66591 + ... + 86121.

It is an arithmetic number, because the mean of its divisors is an integer number (46486160).

Almost surely, 2^1491309036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1491309036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2231335680).

1491309036 is an abundant number, since it is smaller than the sum of its proper divisors (2971362324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1491309036 is a wasteful number, since it uses less digits than its factorization.

1491309036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19652 (or 19644 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 1491309036 is about 38617.4706059317. The cubic root of 1491309036 is about 1142.4991433358.

The spelling of 1491309036 in words is "one billion, four hundred ninety-one million, three hundred nine thousand, thirty-six".