690143 has 2 divisors, whose sum is σ = 690144. Its totient is φ = 690142.

The previous prime is 690139. The next prime is 690163. The reversal of 690143 is 341096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690143 - 2² = 690139 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690103) 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, 345071 + 345072.

It is an arithmetic number, because the mean of its divisors is an integer number (345072).

2⁶⁹⁰¹⁴³ is an apocalyptic number.

690143 is a deficient number, since it is larger than the sum of its proper divisors (1).

690143 is an equidigital number, since it uses as much as digits as its factorization.

690143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 690143 is about 830.7484577175. The cubic root of 690143 is about 88.3716632830.

The spelling of 690143 in words is "six hundred ninety thousand, one hundred forty-three".