681626147 has 2 divisors, whose sum is σ = 681626148. Its totient is φ = 681626146.

The previous prime is 681626021. The next prime is 681626149. The reversal of 681626147 is 741626186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681626147 - 2¹⁴ = 681609763 is a prime.

It is a super-2 number, since 2×681626147² = 929228408548131218, which contains 22 as substring.

Together with 681626149, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (681626149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340813073 + 340813074.

It is an arithmetic number, because the mean of its divisors is an integer number (340813074).

Almost surely, 2^681626147 is an apocalyptic number.

681626147 is a deficient number, since it is larger than the sum of its proper divisors (1).

681626147 is an equidigital number, since it uses as much as digits as its factorization.

681626147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 681626147 is about 26107.9709475861. The cubic root of 681626147 is about 880.0663461514.

The spelling of 681626147 in words is "six hundred eighty-one million, six hundred twenty-six thousand, one hundred forty-seven".