690671543 has 2 divisors, whose sum is σ = 690671544. Its totient is φ = 690671542.

The previous prime is 690671491. The next prime is 690671561. The reversal of 690671543 is 345176096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690671543 - 2⁶ = 690671479 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 690671543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690671243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345335771 + 345335772.

It is an arithmetic number, because the mean of its divisors is an integer number (345335772).

Almost surely, 2^690671543 is an apocalyptic number.

690671543 is a deficient number, since it is larger than the sum of its proper divisors (1).

690671543 is an equidigital number, since it uses as much as digits as its factorization.

690671543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 690671543 is about 26280.6305670165. The cubic root of 690671543 is about 883.9421721043.

The spelling of 690671543 in words is "six hundred ninety million, six hundred seventy-one thousand, five hundred forty-three".