128999293 has 2 divisors, whose sum is σ = 128999294. Its totient is φ = 128999292.

The previous prime is 128999291. The next prime is 128999309. The reversal of 128999293 is 392999821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124255609 + 4743684 = 11147^2 + 2178^2 .

It is an emirp because it is prime and its reverse (392999821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128999293 - 2¹ = 128999291 is a prime.

Together with 128999291, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 128999293.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128999291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64499646 + 64499647.

It is an arithmetic number, because the mean of its divisors is an integer number (64499647).

Almost surely, 2^128999293 is an apocalyptic number.

It is an amenable number.

128999293 is a deficient number, since it is larger than the sum of its proper divisors (1).

128999293 is an equidigital number, since it uses as much as digits as its factorization.

128999293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 52.

The square root of 128999293 is about 11357.7855676184. The cubic root of 128999293 is about 505.2765116413.

The spelling of 128999293 in words is "one hundred twenty-eight million, nine hundred ninety-nine thousand, two hundred ninety-three".