128631319 has 2 divisors, whose sum is σ = 128631320. Its totient is φ = 128631318.

The previous prime is 128631301. The next prime is 128631331. The reversal of 128631319 is 913136821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128631319 is a prime.

It is a super-2 number, since 2×128631319² = 33092032455359522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128631379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64315659 + 64315660.

It is an arithmetic number, because the mean of its divisors is an integer number (64315660).

Almost surely, 2^128631319 is an apocalyptic number.

128631319 is a deficient number, since it is larger than the sum of its proper divisors (1).

128631319 is an equidigital number, since it uses as much as digits as its factorization.

128631319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 128631319 is about 11341.5748024690. The cubic root of 128631319 is about 504.7956157534.

The spelling of 128631319 in words is "one hundred twenty-eight million, six hundred thirty-one thousand, three hundred nineteen".