243661031 has 2 divisors, whose sum is σ = 243661032. Its totient is φ = 243661030.

The previous prime is 243661013. The next prime is 243661037. The reversal of 243661031 is 130166342.

Together with previous prime (243661013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243661031 - 2²² = 239466727 is a prime.

It is a super-2 number, since 2×243661031² = 118741396055965922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243661037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121830515 + 121830516.

It is an arithmetic number, because the mean of its divisors is an integer number (121830516).

Almost surely, 2^243661031 is an apocalyptic number.

243661031 is a deficient number, since it is larger than the sum of its proper divisors (1).

243661031 is an equidigital number, since it uses as much as digits as its factorization.

243661031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 243661031 is about 15609.6454476071. The cubic root of 243661031 is about 624.5904781789.

The spelling of 243661031 in words is "two hundred forty-three million, six hundred sixty-one thousand, thirty-one".