680971651 has 2 divisors, whose sum is σ = 680971652. Its totient is φ = 680971650.

The previous prime is 680971633. The next prime is 680971657. The reversal of 680971651 is 156179086.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 680971651 - 2¹⁷ = 680840579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 680971598 and 680971607.

It is not a weakly prime, because it can be changed into another prime (680971657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340485825 + 340485826.

It is an arithmetic number, because the mean of its divisors is an integer number (340485826).

Almost surely, 2^680971651 is an apocalyptic number.

680971651 is a deficient number, since it is larger than the sum of its proper divisors (1).

680971651 is an equidigital number, since it uses as much as digits as its factorization.

680971651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 680971651 is about 26095.4335277266. The cubic root of 680971651 is about 879.7845766593.

The spelling of 680971651 in words is "six hundred eighty million, nine hundred seventy-one thousand, six hundred fifty-one".