243001631 has 2 divisors, whose sum is σ = 243001632. Its totient is φ = 243001630.

The previous prime is 243001579. The next prime is 243001669. The reversal of 243001631 is 136100342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243001631 is a prime.

It is a super-2 number, since 2×243001631² = 118099585337320322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243001331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121500815 + 121500816.

It is an arithmetic number, because the mean of its divisors is an integer number (121500816).

Almost surely, 2^243001631 is an apocalyptic number.

243001631 is a deficient number, since it is larger than the sum of its proper divisors (1).

243001631 is an equidigital number, since it uses as much as digits as its factorization.

243001631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 243001631 is about 15588.5095823815. The cubic root of 243001631 is about 624.0265430510.

Adding to 243001631 its reverse (136100342), we get a palindrome (379101973).

The spelling of 243001631 in words is "two hundred forty-three million, one thousand, six hundred thirty-one".