1320963556 has 12 divisors (see below), whose sum is σ = 2521839600. Its totient is φ = 600437960.

The previous prime is 1320963533. The next prime is 1320963583. The reversal of 1320963556 is 6553690231.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15010906 + ... + 15010993.

It is an arithmetic number, because the mean of its divisors is an integer number (210153300).

Almost surely, 2^1320963556 is an apocalyptic number.

It is an amenable number.

1320963556 is a deficient number, since it is larger than the sum of its proper divisors (1200876044).

1320963556 is a wasteful number, since it uses less digits than its factorization.

1320963556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30021914 (or 30021912 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 40.

The square root of 1320963556 is about 36345.0623331423. The cubic root of 1320963556 is about 1097.2281606302.

The spelling of 1320963556 in words is "one billion, three hundred twenty million, nine hundred sixty-three thousand, five hundred fifty-six".