681152977 has 2 divisors, whose sum is σ = 681152978. Its totient is φ = 681152976.

The previous prime is 681152963. The next prime is 681153037. The reversal of 681152977 is 779251186.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 496220176 + 184932801 = 22276^2 + 13599^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681152977 is a prime.

It is not a weakly prime, because it can be changed into another prime (681152917) 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, 340576488 + 340576489.

It is an arithmetic number, because the mean of its divisors is an integer number (340576489).

Almost surely, 2^681152977 is an apocalyptic number.

It is an amenable number.

681152977 is a deficient number, since it is larger than the sum of its proper divisors (1).

681152977 is an equidigital number, since it uses as much as digits as its factorization.

681152977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 46.

The square root of 681152977 is about 26098.9075825024. The cubic root of 681152977 is about 879.8626580599.

The spelling of 681152977 in words is "six hundred eighty-one million, one hundred fifty-two thousand, nine hundred seventy-seven".