1961448789 has 8 divisors (see below), whose sum is σ = 2616364800. Its totient is φ = 1307082656.

The previous prime is 1961448781. The next prime is 1961448799. The reversal of 1961448789 is 9878441691.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1961448789 - 2³ = 1961448781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961448781) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 129072 + ... + 143465.

It is an arithmetic number, because the mean of its divisors is an integer number (327045600).

Almost surely, 2^1961448789 is an apocalyptic number.

It is an amenable number.

1961448789 is a deficient number, since it is larger than the sum of its proper divisors (654916011).

1961448789 is a wasteful number, since it uses less digits than its factorization.

1961448789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274939.

The product of its digits is 3483648, while the sum is 57.

The square root of 1961448789 is about 44288.2466236811. The cubic root of 1961448789 is about 1251.7732250023.

The spelling of 1961448789 in words is "one billion, nine hundred sixty-one million, four hundred forty-eight thousand, seven hundred eighty-nine".