1491146636 has 72 divisors (see below), whose sum is σ = 3224775456. Its totient is φ = 599477760.

The previous prime is 1491146627. The next prime is 1491146651. The reversal of 1491146636 is 6366411941.

It is a junction number, because it is equal to n+sod(n) for n = 1491146593 and 1491146602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1402241 + ... + 1403303.

It is an arithmetic number, because the mean of its divisors is an integer number (44788548).

Almost surely, 2^1491146636 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 1491146636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612387728).

1491146636 is an abundant number, since it is smaller than the sum of its proper divisors (1733628820).

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

1491146636 is a wasteful number, since it uses less digits than its factorization.

1491146636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519 (or 1510 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 1491146636 is about 38615.3678734257. The cubic root of 1491146636 is about 1142.4576700190.

The spelling of 1491146636 in words is "one billion, four hundred ninety-one million, one hundred forty-six thousand, six hundred thirty-six".