680871629 has 2 divisors, whose sum is σ = 680871630. Its totient is φ = 680871628.

The previous prime is 680871613. The next prime is 680871637. The reversal of 680871629 is 926178086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620109604 + 60762025 = 24902^2 + 7795^2 .

It is a cyclic number.

It is not a de Polignac number, because 680871629 - 2⁴ = 680871613 is a prime.

It is a super-2 number, since 2×680871629² = 927172350354227282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680871649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340435814 + 340435815.

It is an arithmetic number, because the mean of its divisors is an integer number (340435815).

Almost surely, 2^680871629 is an apocalyptic number.

It is an amenable number.

680871629 is a deficient number, since it is larger than the sum of its proper divisors (1).

680871629 is an equidigital number, since it uses as much as digits as its factorization.

680871629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 680871629 is about 26093.5169917740. The cubic root of 680871629 is about 879.7414999167.

The spelling of 680871629 in words is "six hundred eighty million, eight hundred seventy-one thousand, six hundred twenty-nine".