881818181 has 2 divisors, whose sum is σ = 881818182. Its totient is φ = 881818180.

The previous prime is 881818121. The next prime is 881818193. The reversal of 881818181 is 181818188.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 736253956 + 145564225 = 27134^2 + 12065^2 .

It is a cyclic number.

It is not a de Polignac number, because 881818181 - 2²⁶ = 814709317 is a prime.

It is a super-2 number, since 2×881818181² = 1555206608684297522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (881818121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440909090 + 440909091.

It is an arithmetic number, because the mean of its divisors is an integer number (440909091).

Almost surely, 2^881818181 is an apocalyptic number.

It is an amenable number.

881818181 is a deficient number, since it is larger than the sum of its proper divisors (1).

881818181 is an equidigital number, since it uses as much as digits as its factorization.

881818181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32768, while the sum is 44.

The square root of 881818181 is about 29695.4235699712. The cubic root of 881818181 is about 958.9434922955.

The spelling of 881818181 in words is "eight hundred eighty-one million, eight hundred eighteen thousand, one hundred eighty-one".