243381731 has 2 divisors, whose sum is σ = 243381732. Its totient is φ = 243381730.

The previous prime is 243381703. The next prime is 243381779. The reversal of 243381731 is 137183342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243381731 is a prime.

It is a super-2 number, since 2×243381731² = 118469333969112722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213381731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121690865 + 121690866.

It is an arithmetic number, because the mean of its divisors is an integer number (121690866).

Almost surely, 2^243381731 is an apocalyptic number.

243381731 is a deficient number, since it is larger than the sum of its proper divisors (1).

243381731 is an equidigital number, since it uses as much as digits as its factorization.

243381731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 243381731 is about 15600.6964908622. The cubic root of 243381731 is about 624.3517382966.

The spelling of 243381731 in words is "two hundred forty-three million, three hundred eighty-one thousand, seven hundred thirty-one".