681265289 has 2 divisors, whose sum is σ = 681265290. Its totient is φ = 681265288.

The previous prime is 681265283. The next prime is 681265309. The reversal of 681265289 is 982562186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549199225 + 132066064 = 23435^2 + 11492^2 .

It is a cyclic number.

It is not a de Polignac number, because 681265289 - 2⁸ = 681265033 is a prime.

It is not a weakly prime, because it can be changed into another prime (681265283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340632644 + 340632645.

It is an arithmetic number, because the mean of its divisors is an integer number (340632645).

Almost surely, 2^681265289 is an apocalyptic number.

It is an amenable number.

681265289 is a deficient number, since it is larger than the sum of its proper divisors (1).

681265289 is an equidigital number, since it uses as much as digits as its factorization.

681265289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 47.

The square root of 681265289 is about 26101.0591547546. The cubic root of 681265289 is about 879.9110141597.

The spelling of 681265289 in words is "six hundred eighty-one million, two hundred sixty-five thousand, two hundred eighty-nine".