680172919 has 2 divisors, whose sum is σ = 680172920. Its totient is φ = 680172918.

The previous prime is 680172917. The next prime is 680172923. The reversal of 680172919 is 919271086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680172919 - 2¹ = 680172917 is a prime.

It is a super-2 number, since 2×680172919² = 925270399481961122, which contains 22 as substring.

Together with 680172917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680172917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340086459 + 340086460.

It is an arithmetic number, because the mean of its divisors is an integer number (340086460).

Almost surely, 2^680172919 is an apocalyptic number.

680172919 is a deficient number, since it is larger than the sum of its proper divisors (1).

680172919 is an equidigital number, since it uses as much as digits as its factorization.

680172919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 680172919 is about 26080.1249805288. The cubic root of 680172919 is about 879.4404668780.

The spelling of 680172919 in words is "six hundred eighty million, one hundred seventy-two thousand, nine hundred nineteen".