681339377 has 4 divisors (see below), whose sum is σ = 682537380. Its totient is φ = 680141376.

The previous prime is 681339367. The next prime is 681339389. The reversal of 681339377 is 773933186.

681339377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 409617121 + 271722256 = 20239^2 + 16484^2 .

It is a cyclic number.

It is not a de Polignac number, because 681339377 - 2⁸ = 681339121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681339367) 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, 598148 + ... + 599285.

It is an arithmetic number, because the mean of its divisors is an integer number (170634345).

Almost surely, 2^681339377 is an apocalyptic number.

It is an amenable number.

681339377 is a deficient number, since it is larger than the sum of its proper divisors (1198003).

681339377 is a wasteful number, since it uses less digits than its factorization.

681339377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198002.

The product of its digits is 571536, while the sum is 47.

The square root of 681339377 is about 26102.4783689212. The cubic root of 681339377 is about 879.9429099499.

The spelling of 681339377 in words is "six hundred eighty-one million, three hundred thirty-nine thousand, three hundred seventy-seven".