680817493 has 2 divisors, whose sum is σ = 680817494. Its totient is φ = 680817492.

The previous prime is 680817463. The next prime is 680817499. The reversal of 680817493 is 394718086.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630662769 + 50154724 = 25113^2 + 7082^2 .

It is a cyclic number.

It is not a de Polignac number, because 680817493 - 2¹³ = 680809301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680817499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340408746 + 340408747.

It is an arithmetic number, because the mean of its divisors is an integer number (340408747).

Almost surely, 2^680817493 is an apocalyptic number.

It is an amenable number.

680817493 is a deficient number, since it is larger than the sum of its proper divisors (1).

680817493 is an equidigital number, since it uses as much as digits as its factorization.

680817493 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 46.

The square root of 680817493 is about 26092.4796253633. The cubic root of 680817493 is about 879.7181832609.

The spelling of 680817493 in words is "six hundred eighty million, eight hundred seventeen thousand, four hundred ninety-three".