1891481221716 has 36 divisors (see below), whose sum is σ = 4570892219712. Its totient is φ = 608752573856.

The previous prime is 1891481221681. The next prime is 1891481221717. The reversal of 1891481221716 is 6171221841981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891481221717) 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 11 ways as a sum of consecutive naturals, for example, 93701820 + ... + 93722003.

Almost surely, 2^{1891481221716} is an apocalyptic number.

It is an amenable number.

1891481221716 is an abundant number, since it is smaller than the sum of its proper divisors (2679410997996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1891481221716 is a wasteful number, since it uses less digits than its factorization.

1891481221716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187423888 (or 187423857 counting only the distinct ones).

The product of its digits is 387072, while the sum is 51.

The spelling of 1891481221716 in words is "one trillion, eight hundred ninety-one billion, four hundred eighty-one million, two hundred twenty-one thousand, seven hundred sixteen".