881381681 has 2 divisors, whose sum is σ = 881381682. Its totient is φ = 881381680.

The previous prime is 881381653. The next prime is 881381687. The reversal of 881381681 is 186183188.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 743107600 + 138274081 = 27260^2 + 11759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-881381681 is a prime.

It is a super-2 number, since 2×881381681² = 1553667335204771522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (881381687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440690840 + 440690841.

It is an arithmetic number, because the mean of its divisors is an integer number (440690841).

Almost surely, 2^881381681 is an apocalyptic number.

It is an amenable number.

881381681 is a deficient number, since it is larger than the sum of its proper divisors (1).

881381681 is an equidigital number, since it uses as much as digits as its factorization.

881381681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 44.

The square root of 881381681 is about 29688.0730428905. The cubic root of 881381681 is about 958.7852405047.

The spelling of 881381681 in words is "eight hundred eighty-one million, three hundred eighty-one thousand, six hundred eighty-one".