690140329 has 2 divisors, whose sum is σ = 690140330. Its totient is φ = 690140328.

The previous prime is 690140309. The next prime is 690140333. The reversal of 690140329 is 923041096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541958400 + 148181929 = 23280^2 + 12173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690140329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 690140294 and 690140303.

It is not a weakly prime, because it can be changed into another prime (690140309) 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, 345070164 + 345070165.

It is an arithmetic number, because the mean of its divisors is an integer number (345070165).

Almost surely, 2^690140329 is an apocalyptic number.

It is an amenable number.

690140329 is a deficient number, since it is larger than the sum of its proper divisors (1).

690140329 is an equidigital number, since it uses as much as digits as its factorization.

690140329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 690140329 is about 26270.5220541960. The cubic root of 690140329 is about 883.7154927719.

The spelling of 690140329 in words is "six hundred ninety million, one hundred forty thousand, three hundred twenty-nine".