681248653 has 4 divisors (see below), whose sum is σ = 703224448. Its totient is φ = 659272860.

The previous prime is 681248639. The next prime is 681248669. The reversal of 681248653 is 356842186.

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 not a de Polignac number, because 681248653 - 2¹⁷ = 681117581 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 (681248353) 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, 10987851 + ... + 10987912.

It is an arithmetic number, because the mean of its divisors is an integer number (175806112).

Almost surely, 2^681248653 is an apocalyptic number.

It is an amenable number.

681248653 is a deficient number, since it is larger than the sum of its proper divisors (21975795).

681248653 is a wasteful number, since it uses less digits than its factorization.

681248653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21975794.

The product of its digits is 276480, while the sum is 43.

The square root of 681248653 is about 26100.7404684235. The cubic root of 681248653 is about 879.9038518403.

The spelling of 681248653 in words is "six hundred eighty-one million, two hundred forty-eight thousand, six hundred fifty-three".