1321553942 has 4 divisors (see below), whose sum is σ = 1982330916. Its totient is φ = 660776970.

The previous prime is 1321553929. The next prime is 1321553953. The reversal of 1321553942 is 2493551231.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330388484 + ... + 330388487.

It is an arithmetic number, because the mean of its divisors is an integer number (495582729).

Almost surely, 2^1321553942 is an apocalyptic number.

1321553942 is a deficient number, since it is larger than the sum of its proper divisors (660776974).

1321553942 is an equidigital number, since it uses as much as digits as its factorization.

1321553942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660776973.

The product of its digits is 32400, while the sum is 35.

The square root of 1321553942 is about 36353.1833819268. The cubic root of 1321553942 is about 1097.3915998256.

The spelling of 1321553942 in words is "one billion, three hundred twenty-one million, five hundred fifty-three thousand, nine hundred forty-two".