1961981695 has 16 divisors (see below), whose sum is σ = 2391966720. Its totient is φ = 1544608800.

The previous prime is 1961981687. The next prime is 1961981717. The reversal of 1961981695 is 5961891691.

It is not a de Polignac number, because 1961981695 - 2³ = 1961981687 is a prime.

It is a congruent number.

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, 197866 + ... + 207544.

It is an arithmetic number, because the mean of its divisors is an integer number (149497920).

Almost surely, 2^1961981695 is an apocalyptic number.

1961981695 is a deficient number, since it is larger than the sum of its proper divisors (429985025).

1961981695 is an equidigital number, since it uses as much as digits as its factorization.

1961981695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10326.

The product of its digits is 1049760, while the sum is 55.

The square root of 1961981695 is about 44294.2625517120. The cubic root of 1961981695 is about 1251.8865794885.

It can be divided in two parts, 196 and 1981695, that added together give a palindrome (1981891).

The spelling of 1961981695 in words is "one billion, nine hundred sixty-one million, nine hundred eighty-one thousand, six hundred ninety-five".