1961561392 has 80 divisors (see below), whose sum is σ = 4555333440. Its totient is φ = 800464896.

The previous prime is 1961561383. The next prime is 1961561431. The reversal of 1961561392 is 2931651691.

It is a super-3 number, since 3×1961561392³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232968 + ... + 241240.

It is an arithmetic number, because the mean of its divisors is an integer number (56941668).

Almost surely, 2^1961561392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1961561392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2277666720).

1961561392 is an abundant number, since it is smaller than the sum of its proper divisors (2593772048).

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

1961561392 is a wasteful number, since it uses less digits than its factorization.

1961561392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8390 (or 8384 counting only the distinct ones).

The product of its digits is 87480, while the sum is 43.

The square root of 1961561392 is about 44289.5178569377. The cubic root of 1961561392 is about 1251.7971785079.

The spelling of 1961561392 in words is "one billion, nine hundred sixty-one million, five hundred sixty-one thousand, three hundred ninety-two".