243035861 has 2 divisors, whose sum is σ = 243035862. Its totient is φ = 243035860.

The previous prime is 243035839. The next prime is 243035873. The reversal of 243035861 is 168530342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235162225 + 7873636 = 15335^2 + 2806^2 .

It is a cyclic number.

It is not a de Polignac number, because 243035861 - 2⁶ = 243035797 is a prime.

It is a super-2 number, since 2×243035861² = 118132859464022642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243055861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121517930 + 121517931.

It is an arithmetic number, because the mean of its divisors is an integer number (121517931).

Almost surely, 2^243035861 is an apocalyptic number.

It is an amenable number.

243035861 is a deficient number, since it is larger than the sum of its proper divisors (1).

243035861 is an equidigital number, since it uses as much as digits as its factorization.

243035861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 243035861 is about 15589.6074677973. The cubic root of 243035861 is about 624.0558424781.

The spelling of 243035861 in words is "two hundred forty-three million, thirty-five thousand, eight hundred sixty-one".