268440631 has 2 divisors, whose sum is σ = 268440632. Its totient is φ = 268440630.

The previous prime is 268440629. The next prime is 268440649. The reversal of 268440631 is 136044862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 268440631 - 2¹ = 268440629 is a prime.

It is a super-2 number, since 2×268440631² = 144120744743356322, which contains 22 as substring.

Together with 268440629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268440611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134220315 + 134220316.

It is an arithmetic number, because the mean of its divisors is an integer number (134220316).

Almost surely, 2^268440631 is an apocalyptic number.

268440631 is a deficient number, since it is larger than the sum of its proper divisors (1).

268440631 is an equidigital number, since it uses as much as digits as its factorization.

268440631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 268440631 is about 16384.1579277057. The cubic root of 268440631 is about 645.0837228820.

The spelling of 268440631 in words is "two hundred sixty-eight million, four hundred forty thousand, six hundred thirty-one".