681813053 has 2 divisors, whose sum is σ = 681813054. Its totient is φ = 681813052.

The previous prime is 681813029. The next prime is 681813059. The reversal of 681813053 is 350318186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 578546809 + 103266244 = 24053^2 + 10162^2 .

It is a cyclic number.

It is not a de Polignac number, because 681813053 - 2¹⁰ = 681812029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681813059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340906526 + 340906527.

It is an arithmetic number, because the mean of its divisors is an integer number (340906527).

Almost surely, 2^681813053 is an apocalyptic number.

It is an amenable number.

681813053 is a deficient number, since it is larger than the sum of its proper divisors (1).

681813053 is an equidigital number, since it uses as much as digits as its factorization.

681813053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 681813053 is about 26111.5501837788. The cubic root of 681813053 is about 880.1467786332.

The spelling of 681813053 in words is "six hundred eighty-one million, eight hundred thirteen thousand, fifty-three".