243690731 has 2 divisors, whose sum is σ = 243690732. Its totient is φ = 243690730.

The previous prime is 243690703. The next prime is 243690743. The reversal of 243690731 is 137096342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243690731 is a prime.

It is a super-2 number, since 2×243690731² = 118770344750628722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243690691 and 243690700.

It is not a weakly prime, because it can be changed into another prime (243690701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121845365 + 121845366.

It is an arithmetic number, because the mean of its divisors is an integer number (121845366).

Almost surely, 2^243690731 is an apocalyptic number.

243690731 is a deficient number, since it is larger than the sum of its proper divisors (1).

243690731 is an equidigital number, since it uses as much as digits as its factorization.

243690731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 243690731 is about 15610.5967534877. The cubic root of 243690731 is about 624.6158543932.

The spelling of 243690731 in words is "two hundred forty-three million, six hundred ninety thousand, seven hundred thirty-one".