1881891259771 has 16 divisors (see below), whose sum is σ = 2010159901440. Its totient is φ = 1756577823840.

The previous prime is 1881891259583. The next prime is 1881891259777. The reversal of 1881891259771 is 1779521981881.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1881891259771 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1881891259697 and 1881891259706.

It is not an unprimeable number, because it can be changed into a prime (1881891259777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1596541 + ... + 2512513.

It is an arithmetic number, because the mean of its divisors is an integer number (125634993840).

Almost surely, 2^{1881891259771} is an apocalyptic number.

1881891259771 is a deficient number, since it is larger than the sum of its proper divisors (128268641669).

1881891259771 is a wasteful number, since it uses less digits than its factorization.

1881891259771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917586.

The product of its digits is 20321280, while the sum is 67.

The spelling of 1881891259771 in words is "one trillion, eight hundred eighty-one billion, eight hundred ninety-one million, two hundred fifty-nine thousand, seven hundred seventy-one".