1491221248 has 72 divisors (see below), whose sum is σ = 3267056016. Its totient is φ = 673689600.

The previous prime is 1491221219. The next prime is 1491221269. The reversal of 1491221248 is 8421221941.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485638 + ... + 488698.

It is an arithmetic number, because the mean of its divisors is an integer number (45375778).

Almost surely, 2^1491221248 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 1491221248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1633528008).

1491221248 is an abundant number, since it is smaller than the sum of its proper divisors (1775834768).

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

1491221248 is a wasteful number, since it uses less digits than its factorization.

1491221248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261 (or 3247 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 1491221248 is about 38616.3339533933. Note that the first 3 decimals coincide. The cubic root of 1491221248 is about 1142.4767246239.

The spelling of 1491221248 in words is "one billion, four hundred ninety-one million, two hundred twenty-one thousand, two hundred forty-eight".