681989167 has 2 divisors, whose sum is σ = 681989168. Its totient is φ = 681989166.

The previous prime is 681989093. The next prime is 681989219. The reversal of 681989167 is 761989186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681989167 - 2¹⁵ = 681956399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681986167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340994583 + 340994584.

It is an arithmetic number, because the mean of its divisors is an integer number (340994584).

Almost surely, 2^681989167 is an apocalyptic number.

681989167 is a deficient number, since it is larger than the sum of its proper divisors (1).

681989167 is an equidigital number, since it uses as much as digits as its factorization.

681989167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 55.

The square root of 681989167 is about 26114.9223050730. The cubic root of 681989167 is about 880.2225534735. Note that the first 3 decimals are identical.

The spelling of 681989167 in words is "six hundred eighty-one million, nine hundred eighty-nine thousand, one hundred sixty-seven".