1881169681 has 2 divisors, whose sum is σ = 1881169682. Its totient is φ = 1881169680.

The previous prime is 1881169673. The next prime is 1881169687. The reversal of 1881169681 is 1869611881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1754269456 + 126900225 = 41884^2 + 11265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881169681 - 2³ = 1881169673 is a prime.

It is a super-2 number, since 2×1881169681² = 7077598737427283522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1881169687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940584840 + 940584841.

It is an arithmetic number, because the mean of its divisors is an integer number (940584841).

Almost surely, 2^1881169681 is an apocalyptic number.

It is an amenable number.

1881169681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881169681 is an equidigital number, since it uses as much as digits as its factorization.

1881169681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 49.

The square root of 1881169681 is about 43372.4530203216. The cubic root of 1881169681 is about 1234.4570667744.

The spelling of 1881169681 in words is "one billion, eight hundred eighty-one million, one hundred sixty-nine thousand, six hundred eighty-one".