690143639 has 2 divisors, whose sum is σ = 690143640. Its totient is φ = 690143638.

The previous prime is 690143621. The next prime is 690143677. The reversal of 690143639 is 936341096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690143639 - 2⁸ = 690143383 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 690143596 and 690143605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690143039) 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, 345071819 + 345071820.

It is an arithmetic number, because the mean of its divisors is an integer number (345071820).

Almost surely, 2^690143639 is an apocalyptic number.

690143639 is a deficient number, since it is larger than the sum of its proper divisors (1).

690143639 is an equidigital number, since it uses as much as digits as its factorization.

690143639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 690143639 is about 26270.5850524879. The cubic root of 690143639 is about 883.7169055732.

The spelling of 690143639 in words is "six hundred ninety million, one hundred forty-three thousand, six hundred thirty-nine".