1491611228 has 12 divisors (see below), whose sum is σ = 2636165112. Its totient is φ = 738421200.

The previous prime is 1491611227. The next prime is 1491611287. The reversal of 1491611228 is 8221161941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491611227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1845650 + ... + 1846457.

It is an arithmetic number, because the mean of its divisors is an integer number (219680426).

Almost surely, 2^1491611228 is an apocalyptic number.

It is an amenable number.

1491611228 is a deficient number, since it is larger than the sum of its proper divisors (1144553884).

1491611228 is a wasteful number, since it uses less digits than its factorization.

1491611228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3692212 (or 3692210 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The square root of 1491611228 is about 38621.3830410046. The cubic root of 1491611228 is about 1142.5763083801.

The spelling of 1491611228 in words is "one billion, four hundred ninety-one million, six hundred eleven thousand, two hundred twenty-eight".