243698437 has 2 divisors, whose sum is σ = 243698438. Its totient is φ = 243698436.

The previous prime is 243698393. The next prime is 243698453. The reversal of 243698437 is 734896342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151807041 + 91891396 = 12321^2 + 9586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243698437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243698467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121849218 + 121849219.

It is an arithmetic number, because the mean of its divisors is an integer number (121849219).

Almost surely, 2^243698437 is an apocalyptic number.

It is an amenable number.

243698437 is a deficient number, since it is larger than the sum of its proper divisors (1).

243698437 is an equidigital number, since it uses as much as digits as its factorization.

243698437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 46.

The square root of 243698437 is about 15610.8435710566. The cubic root of 243698437 is about 624.6224382013.

The spelling of 243698437 in words is "two hundred forty-three million, six hundred ninety-eight thousand, four hundred thirty-seven".