1891947981362 has 32 divisors (see below), whose sum is σ = 2928457786800. Its totient is φ = 916041166848.

The previous prime is 1891947981353. The next prime is 1891947981403. The reversal of 1891947981362 is 2631897491981.

It is a Cunningham number, because it is equal to 1375481²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1692941879161 + 199006102201 = 1301131^2 + 446101^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1891947981292 and 1891947981301.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 47988314 + ... + 48027722.

Almost surely, 2^{1891947981362} is an apocalyptic number.

1891947981362 is a deficient number, since it is larger than the sum of its proper divisors (1036509805438).

1891947981362 is a wasteful number, since it uses less digits than its factorization.

1891947981362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42510.

The product of its digits is 47029248, while the sum is 68.

The spelling of 1891947981362 in words is "one trillion, eight hundred ninety-one billion, nine hundred forty-seven million, nine hundred eighty-one thousand, three hundred sixty-two".