128886631 has 2 divisors, whose sum is σ = 128886632. Its totient is φ = 128886630.

The previous prime is 128886629. The next prime is 128886647. The reversal of 128886631 is 136688821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128886631 - 2¹ = 128886629 is a prime.

It is a super-2 number, since 2×128886631² = 33223527301060322, which contains 22 as substring.

Together with 128886629, 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 (128886731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64443315 + 64443316.

It is an arithmetic number, because the mean of its divisors is an integer number (64443316).

Almost surely, 2^128886631 is an apocalyptic number.

128886631 is a deficient number, since it is larger than the sum of its proper divisors (1).

128886631 is an equidigital number, since it uses as much as digits as its factorization.

128886631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 43.

The square root of 128886631 is about 11352.8248026648. The cubic root of 128886631 is about 505.1293737743.

The spelling of 128886631 in words is "one hundred twenty-eight million, eight hundred eighty-six thousand, six hundred thirty-one".