263626631 has 2 divisors, whose sum is σ = 263626632. Its totient is φ = 263626630.

The previous prime is 263626603. The next prime is 263626661. The reversal of 263626631 is 136626362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 263626631 - 2¹⁴ = 263610247 is a prime.

It is a super-2 number, since 2×263626631² = 138998001144820322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 263626591 and 263626600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263626661) 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, 131813315 + 131813316.

It is an arithmetic number, because the mean of its divisors is an integer number (131813316).

Almost surely, 2^263626631 is an apocalyptic number.

263626631 is a deficient number, since it is larger than the sum of its proper divisors (1).

263626631 is an equidigital number, since it uses as much as digits as its factorization.

263626631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 35.

The square root of 263626631 is about 16236.5831072920. The cubic root of 263626631 is about 641.2043006190.

The spelling of 263626631 in words is "two hundred sixty-three million, six hundred twenty-six thousand, six hundred thirty-one".