680955901 has 2 divisors, whose sum is σ = 680955902. Its totient is φ = 680955900.

The previous prime is 680955883. The next prime is 680955949. The reversal of 680955901 is 109559086.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524455801 + 156500100 = 22901^2 + 12510^2 .

It is a cyclic number.

It is not a de Polignac number, because 680955901 - 2⁹ = 680955389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680455901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340477950 + 340477951.

It is an arithmetic number, because the mean of its divisors is an integer number (340477951).

Almost surely, 2^680955901 is an apocalyptic number.

It is an amenable number.

680955901 is a deficient number, since it is larger than the sum of its proper divisors (1).

680955901 is an equidigital number, since it uses as much as digits as its factorization.

680955901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 680955901 is about 26095.1317490447. The cubic root of 680955901 is about 879.7777938445. Note that the first 4 decimals are identical.

The spelling of 680955901 in words is "six hundred eighty million, nine hundred fifty-five thousand, nine hundred one".