690671243 has 2 divisors, whose sum is σ = 690671244. Its totient is φ = 690671242.

The previous prime is 690671231. The next prime is 690671263. The reversal of 690671243 is 342176096.

690671243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690671243 - 2⁸ = 690670987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 690671197 and 690671206.

It is not a weakly prime, because it can be changed into another prime (690671263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345335621 + 345335622.

It is an arithmetic number, because the mean of its divisors is an integer number (345335622).

Almost surely, 2^690671243 is an apocalyptic number.

690671243 is a deficient number, since it is larger than the sum of its proper divisors (1).

690671243 is an equidigital number, since it uses as much as digits as its factorization.

690671243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 690671243 is about 26280.6248593902. The cubic root of 690671243 is about 883.9420441212.

The spelling of 690671243 in words is "six hundred ninety million, six hundred seventy-one thousand, two hundred forty-three".