128436631 has 2 divisors, whose sum is σ = 128436632. Its totient is φ = 128436630.

The previous prime is 128436601. The next prime is 128436643. The reversal of 128436631 is 136634821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128436631 - 2¹¹ = 128434583 is a prime.

It is a super-2 number, since 2×128436631² = 32991936365260322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128436601) 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, 64218315 + 64218316.

It is an arithmetic number, because the mean of its divisors is an integer number (64218316).

Almost surely, 2^128436631 is an apocalyptic number.

128436631 is a deficient number, since it is larger than the sum of its proper divisors (1).

128436631 is an equidigital number, since it uses as much as digits as its factorization.

128436631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 128436631 is about 11332.9886173066. The cubic root of 128436631 is about 504.5408118857.

The spelling of 128436631 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, six hundred thirty-one".