681334001 has 2 divisors, whose sum is σ = 681334002. Its totient is φ = 681334000.

The previous prime is 681333997. The next prime is 681334019. The reversal of 681334001 is 100433186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386319025 + 295014976 = 19655^2 + 17176^2 .

It is a cyclic number.

It is not a de Polignac number, because 681334001 - 2² = 681333997 is a prime.

It is equal to p_35335502 and since 681334001 and 35335502 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (681334081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340667000 + 340667001.

It is an arithmetic number, because the mean of its divisors is an integer number (340667001).

Almost surely, 2^681334001 is an apocalyptic number.

It is an amenable number.

681334001 is a deficient number, since it is larger than the sum of its proper divisors (1).

681334001 is an equidigital number, since it uses as much as digits as its factorization.

681334001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 681334001 is about 26102.3753899909. The cubic root of 681334001 is about 879.9405955940.

Adding to 681334001 its reverse (100433186), we get a palindrome (781767187).

The spelling of 681334001 in words is "six hundred eighty-one million, three hundred thirty-four thousand, one".