681627053 has 4 divisors (see below), whose sum is σ = 721722780. Its totient is φ = 641531328.

The previous prime is 681627029. The next prime is 681627073. The reversal of 681627053 is 350726186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 350726186 = 2 ⋅175363093.

It can be written as a sum of positive squares in 2 ways, for example, as 505215529 + 176411524 = 22477^2 + 13282^2 .

It is a cyclic number.

It is not a de Polignac number, because 681627053 - 2⁸ = 681626797 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681626998 and 681627016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681627073) 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, 20047838 + ... + 20047871.

It is an arithmetic number, because the mean of its divisors is an integer number (180430695).

Almost surely, 2^681627053 is an apocalyptic number.

It is an amenable number.

681627053 is a deficient number, since it is larger than the sum of its proper divisors (40095727).

681627053 is a wasteful number, since it uses less digits than its factorization.

681627053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40095726.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 681627053 is about 26107.9882986032. The cubic root of 681627053 is about 880.0667360718.

The spelling of 681627053 in words is "six hundred eighty-one million, six hundred twenty-seven thousand, fifty-three".