681533929 has 2 divisors, whose sum is σ = 681533930. Its totient is φ = 681533928.

The previous prime is 681533921. The next prime is 681533987. The reversal of 681533929 is 929335186.

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., 680427225 + 1106704 = 26085^2 + 1052^2 .

It is a cyclic number.

It is not a de Polignac number, because 681533929 - 2³ = 681533921 is a prime.

It is not a weakly prime, because it can be changed into another prime (681533921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340766964 + 340766965.

It is an arithmetic number, because the mean of its divisors is an integer number (340766965).

Almost surely, 2^681533929 is an apocalyptic number.

It is an amenable number.

681533929 is a deficient number, since it is larger than the sum of its proper divisors (1).

681533929 is an equidigital number, since it uses as much as digits as its factorization.

681533929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 46.

The square root of 681533929 is about 26106.2047988596. The cubic root of 681533929 is about 880.0266559591.

The spelling of 681533929 in words is "six hundred eighty-one million, five hundred thirty-three thousand, nine hundred twenty-nine".