1961948559 has 8 divisors (see below), whose sum is σ = 2619371952. Its totient is φ = 1306245440.

The previous prime is 1961948557. The next prime is 1961948561. The reversal of 1961948559 is 9558491691.

It is an interprime number because it is at equal distance from previous prime (1961948557) and next prime (1961948561).

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 1961948559 - 2¹ = 1961948557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1961948499 and 1961948508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961948557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427404 + ... + 431969.

It is an arithmetic number, because the mean of its divisors is an integer number (327421494).

Almost surely, 2^1961948559 is an apocalyptic number.

1961948559 is a deficient number, since it is larger than the sum of its proper divisors (657423393).

1961948559 is an equidigital number, since it uses as much as digits as its factorization.

1961948559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860137.

The product of its digits is 3499200, while the sum is 57.

The square root of 1961948559 is about 44293.8885062037. Note that the first 3 decimals coincide. The cubic root of 1961948559 is about 1251.8795317253.

The spelling of 1961948559 in words is "one billion, nine hundred sixty-one million, nine hundred forty-eight thousand, five hundred fifty-nine".