680241749 has 4 divisors (see below), whose sum is σ = 742081920. Its totient is φ = 618401580.

The previous prime is 680241733. The next prime is 680241787. The reversal of 680241749 is 947142086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 680241749 - 2⁴ = 680241733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680241449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30920069 + ... + 30920090.

It is an arithmetic number, because the mean of its divisors is an integer number (185520480).

Almost surely, 2^680241749 is an apocalyptic number.

It is an amenable number.

680241749 is a deficient number, since it is larger than the sum of its proper divisors (61840171).

680241749 is a wasteful number, since it uses less digits than its factorization.

680241749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61840170.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 680241749 is about 26081.4445343811. Note that the first 3 decimals coincide. The cubic root of 680241749 is about 879.4701308277.

The spelling of 680241749 in words is "six hundred eighty million, two hundred forty-one thousand, seven hundred forty-nine".