681265933 has 2 divisors, whose sum is σ = 681265934. Its totient is φ = 681265932.

The previous prime is 681265931. The next prime is 681265943. The reversal of 681265933 is 339562186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409576644 + 271689289 = 20238^2 + 16483^2 .

It is a cyclic number.

It is not a de Polignac number, because 681265933 - 2¹ = 681265931 is a prime.

Together with 681265931, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 681265933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681265931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340632966 + 340632967.

It is an arithmetic number, because the mean of its divisors is an integer number (340632967).

Almost surely, 2^681265933 is an apocalyptic number.

It is an amenable number.

681265933 is a deficient number, since it is larger than the sum of its proper divisors (1).

681265933 is an equidigital number, since it uses as much as digits as its factorization.

681265933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 681265933 is about 26101.0714914158. The cubic root of 681265933 is about 879.9112914196.

The spelling of 681265933 in words is "six hundred eighty-one million, two hundred sixty-five thousand, nine hundred thirty-three".