681427553 has 2 divisors, whose sum is σ = 681427554. Its totient is φ = 681427552.

The previous prime is 681427499. The next prime is 681427583. The reversal of 681427553 is 355724186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570588769 + 110838784 = 23887^2 + 10528^2 .

It is a cyclic number.

It is not a de Polignac number, because 681427553 - 2⁶ = 681427489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681427553.

It is not a weakly prime, because it can be changed into another prime (681427583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340713776 + 340713777.

It is an arithmetic number, because the mean of its divisors is an integer number (340713777).

Almost surely, 2^681427553 is an apocalyptic number.

It is an amenable number.

681427553 is a deficient number, since it is larger than the sum of its proper divisors (1).

681427553 is an equidigital number, since it uses as much as digits as its factorization.

681427553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 41.

The square root of 681427553 is about 26104.1673492950. The cubic root of 681427553 is about 879.9808677831.

The spelling of 681427553 in words is "six hundred eighty-one million, four hundred twenty-seven thousand, five hundred fifty-three".