1491221212 has 24 divisors (see below), whose sum is σ = 2886338336. Its totient is φ = 669653568.

The previous prime is 1491221201. The next prime is 1491221219. The reversal of 1491221212 is 2121221941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491221219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385608 + ... + 389455.

Almost surely, 2^1491221212 is an apocalyptic number.

It is an amenable number.

1491221212 is a deficient number, since it is larger than the sum of its proper divisors (1395117124).

1491221212 is a wasteful number, since it uses less digits than its factorization.

1491221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775117 (or 775115 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 1491221212 is about 38616.3334872693. Note that the first 3 decimals coincide. The cubic root of 1491221212 is about 1142.4767154302.

The spelling of 1491221212 in words is "one billion, four hundred ninety-one million, two hundred twenty-one thousand, two hundred twelve".