681503601 has 8 divisors (see below), whose sum is σ = 908792224. Its totient is φ = 454275360.

The previous prime is 681503591. The next prime is 681503611. The reversal of 681503601 is 106305186.

It is an interprime number because it is at equal distance from previous prime (681503591) and next prime (681503611).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 681503601 - 2⁵ = 681503569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681503611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34890 + ... + 50796.

It is an arithmetic number, because the mean of its divisors is an integer number (113599028).

Almost surely, 2^681503601 is an apocalyptic number.

It is an amenable number.

681503601 is a deficient number, since it is larger than the sum of its proper divisors (227288623).

681503601 is a wasteful number, since it uses less digits than its factorization.

681503601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30191.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 681503601 is about 26105.6239343173. The cubic root of 681503601 is about 880.0136021486.

Adding to 681503601 its reverse (106305186), we get a palindrome (787808787).

The spelling of 681503601 in words is "six hundred eighty-one million, five hundred three thousand, six hundred one".