1321518961 has 8 divisors (see below), whose sum is σ = 1521837504. Its totient is φ = 1124082960.

The previous prime is 1321518959. The next prime is 1321518971. The reversal of 1321518961 is 1698151231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321518961 - 2¹ = 1321518959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321518961.

It is not an unprimeable number, because it can be changed into a prime (1321518901) 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, 719650 + ... + 721483.

It is an arithmetic number, because the mean of its divisors is an integer number (190229688).

Almost surely, 2^1321518961 is an apocalyptic number.

It is an amenable number.

1321518961 is a deficient number, since it is larger than the sum of its proper divisors (200318543).

1321518961 is a wasteful number, since it uses less digits than its factorization.

1321518961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441271.

The product of its digits is 12960, while the sum is 37.

The square root of 1321518961 is about 36352.7022516896. The cubic root of 1321518961 is about 1097.3819172358.

The spelling of 1321518961 in words is "one billion, three hundred twenty-one million, five hundred eighteen thousand, nine hundred sixty-one".