243412993 has 2 divisors, whose sum is σ = 243412994. Its totient is φ = 243412992.

The previous prime is 243412931. The next prime is 243413011. The reversal of 243412993 is 399214342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221622769 + 21790224 = 14887^2 + 4668^2 .

It is a cyclic number.

It is not a de Polignac number, because 243412993 - 2¹⁷ = 243281921 is a prime.

It is a super-2 number, since 2×243412993² = 118499770322436098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243415993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121706496 + 121706497.

It is an arithmetic number, because the mean of its divisors is an integer number (121706497).

Almost surely, 2^243412993 is an apocalyptic number.

It is an amenable number.

243412993 is a deficient number, since it is larger than the sum of its proper divisors (1).

243412993 is an equidigital number, since it uses as much as digits as its factorization.

243412993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 37.

The square root of 243412993 is about 15601.6984011357. The cubic root of 243412993 is about 624.3784694846.

The spelling of 243412993 in words is "two hundred forty-three million, four hundred twelve thousand, nine hundred ninety-three".