681533429 has 2 divisors, whose sum is σ = 681533430. Its totient is φ = 681533428.

The previous prime is 681533407. The next prime is 681533453. The reversal of 681533429 is 924335186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644652100 + 36881329 = 25390^2 + 6073^2 .

It is a cyclic number.

It is not a de Polignac number, because 681533429 - 2¹² = 681529333 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681533459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340766714 + 340766715.

It is an arithmetic number, because the mean of its divisors is an integer number (340766715).

Almost surely, 2^681533429 is an apocalyptic number.

It is an amenable number.

681533429 is a deficient number, since it is larger than the sum of its proper divisors (1).

681533429 is an equidigital number, since it uses as much as digits as its factorization.

681533429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 41.

The square root of 681533429 is about 26106.1952225904. The cubic root of 681533429 is about 880.0264407517.

The spelling of 681533429 in words is "six hundred eighty-one million, five hundred thirty-three thousand, four hundred twenty-nine".