681241601 has 4 divisors (see below), whose sum is σ = 685047600. Its totient is φ = 677435604.

The previous prime is 681241579. The next prime is 681241619. The reversal of 681241601 is 106142186.

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 a de Polignac number, because none of the positive numbers 2^k-681241601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (681241661) 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, 1902731 + ... + 1903088.

It is an arithmetic number, because the mean of its divisors is an integer number (171261900).

Almost surely, 2^681241601 is an apocalyptic number.

It is an amenable number.

681241601 is a deficient number, since it is larger than the sum of its proper divisors (3805999).

681241601 is a wasteful number, since it uses less digits than its factorization.

681241601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3805998.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 681241601 is about 26100.6053761211. The cubic root of 681241601 is about 879.9008156981.

Adding to 681241601 its reverse (106142186), we get a palindrome (787383787).

The spelling of 681241601 in words is "six hundred eighty-one million, two hundred forty-one thousand, six hundred one".