681883871 has 2 divisors, whose sum is σ = 681883872. Its totient is φ = 681883870.

The previous prime is 681883859. The next prime is 681883877. The reversal of 681883871 is 178388186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681883871 - 2¹⁰ = 681882847 is a prime.

It is a super-2 number, since 2×681883871² = 929931227059889282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681883877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340941935 + 340941936.

It is an arithmetic number, because the mean of its divisors is an integer number (340941936).

Almost surely, 2^681883871 is an apocalyptic number.

681883871 is a deficient number, since it is larger than the sum of its proper divisors (1).

681883871 is an equidigital number, since it uses as much as digits as its factorization.

681883871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 50.

The square root of 681883871 is about 26112.9062151266. The cubic root of 681883871 is about 880.1772503666.

The spelling of 681883871 in words is "six hundred eighty-one million, eight hundred eighty-three thousand, eight hundred seventy-one".