961891321000 has 64 divisors (see below), whose sum is σ = 2369290248000. Its totient is φ = 364506177600.

The previous prime is 961891320983. The next prime is 961891321003. The reversal of 961891321000 is 123198169.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (961891321003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25293930 + ... + 25331929.

It is an arithmetic number, because the mean of its divisors is an integer number (37020160125).

Almost surely, 2^961891321000 is an apocalyptic number.

It is an amenable number.

961891321000 is an abundant number, since it is smaller than the sum of its proper divisors (1407398927000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

961891321000 is a wasteful number, since it uses less digits than its factorization.

961891321000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50625899 (or 50625885 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 961891321000 in words is "nine hundred sixty-one billion, eight hundred ninety-one million, three hundred twenty-one thousand".