1961870818 has 16 divisors (see below), whose sum is σ = 2988366624. Its totient is φ = 965764800.

The previous prime is 1961870809. The next prime is 1961870819. The reversal of 1961870818 is 8180781691.

It is not an unprimeable number, because it can be changed into a prime (1961870819) 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, 372721 + ... + 377947.

It is an arithmetic number, because the mean of its divisors is an integer number (186772914).

Almost surely, 2^1961870818 is an apocalyptic number.

1961870818 is a deficient number, since it is larger than the sum of its proper divisors (1026495806).

1961870818 is a wasteful number, since it uses less digits than its factorization.

1961870818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8097.

The product of its (nonzero) digits is 193536, while the sum is 49.

The square root of 1961870818 is about 44293.0109385217. The cubic root of 1961870818 is about 1251.8629965224.

The spelling of 1961870818 in words is "one billion, nine hundred sixty-one million, eight hundred seventy thousand, eight hundred eighteen".