681399541 has 16 divisors (see below), whose sum is σ = 730251648. Its totient is φ = 634233600.

The previous prime is 681399529. The next prime is 681399583. The reversal of 681399541 is 145993186.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681399541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681399491 and 681399500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681349541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515161 + ... + 516481.

It is an arithmetic number, because the mean of its divisors is an integer number (45640728).

Almost surely, 2^681399541 is an apocalyptic number.

It is an amenable number.

681399541 is a deficient number, since it is larger than the sum of its proper divisors (48852107).

681399541 is a wasteful number, since it uses less digits than its factorization.

681399541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932.

The product of its digits is 233280, while the sum is 46.

The square root of 681399541 is about 26103.6308010974. The cubic root of 681399541 is about 879.9688095867.

The spelling of 681399541 in words is "six hundred eighty-one million, three hundred ninety-nine thousand, five hundred forty-one".