1288622129 has 2 divisors, whose sum is σ = 1288622130. Its totient is φ = 1288622128.

The previous prime is 1288622033. The next prime is 1288622131. The reversal of 1288622129 is 9212268821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 944148529 + 344473600 = 30727^2 + 18560^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288622129 - 2²⁴ = 1271844913 is a prime.

Together with 1288622131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1288622149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644311064 + 644311065.

It is an arithmetic number, because the mean of its divisors is an integer number (644311065).

Almost surely, 2^1288622129 is an apocalyptic number.

It is an amenable number.

1288622129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288622129 is an equidigital number, since it uses as much as digits as its factorization.

1288622129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 41.

The square root of 1288622129 is about 35897.3833168937. The cubic root of 1288622129 is about 1088.1995158479.

The spelling of 1288622129 in words is "one billion, two hundred eighty-eight million, six hundred twenty-two thousand, one hundred twenty-nine".