243899701 has 2 divisors, whose sum is σ = 243899702. Its totient is φ = 243899700.

The previous prime is 243899699. The next prime is 243899743. The reversal of 243899701 is 107998342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131560900 + 112338801 = 11470^2 + 10599^2 .

It is a cyclic number.

It is not a de Polignac number, because 243899701 - 2¹ = 243899699 is a prime.

Together with 243899699, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243899801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121949850 + 121949851.

It is an arithmetic number, because the mean of its divisors is an integer number (121949851).

Almost surely, 2^243899701 is an apocalyptic number.

It is an amenable number.

243899701 is a deficient number, since it is larger than the sum of its proper divisors (1).

243899701 is an equidigital number, since it uses as much as digits as its factorization.

243899701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 243899701 is about 15617.2885290629. The cubic root of 243899701 is about 624.7943438563.

The spelling of 243899701 in words is "two hundred forty-three million, eight hundred ninety-nine thousand, seven hundred one".