681391453 has 16 divisors (see below), whose sum is σ = 716976000. Its totient is φ = 646712640.

The previous prime is 681391429. The next prime is 681391463. The reversal of 681391453 is 354193186.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681391453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681391463) 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, 444298 + ... + 445828.

It is an arithmetic number, because the mean of its divisors is an integer number (44811000).

Almost surely, 2^681391453 is an apocalyptic number.

It is an amenable number.

681391453 is a deficient number, since it is larger than the sum of its proper divisors (35584547).

681391453 is a wasteful number, since it uses less digits than its factorization.

681391453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812.

The product of its digits is 77760, while the sum is 40.

The square root of 681391453 is about 26103.4758796602. The cubic root of 681391453 is about 879.9653279211.

The spelling of 681391453 in words is "six hundred eighty-one million, three hundred ninety-one thousand, four hundred fifty-three".