1264720129 has 2 divisors, whose sum is σ = 1264720130. Its totient is φ = 1264720128.

The previous prime is 1264720111. The next prime is 1264720139. The reversal of 1264720129 is 9210274621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792309904 + 472410225 = 28148^2 + 21735^2 .

It is an emirp because it is prime and its reverse (9210274621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1264720129 - 2²⁵ = 1231165697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1264720094 and 1264720103.

It is not a weakly prime, because it can be changed into another prime (1264720139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632360064 + 632360065.

It is an arithmetic number, because the mean of its divisors is an integer number (632360065).

Almost surely, 2^1264720129 is an apocalyptic number.

It is an amenable number.

1264720129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264720129 is an equidigital number, since it uses as much as digits as its factorization.

1264720129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 1264720129 is about 35562.9038325050. The cubic root of 1264720129 is about 1081.4293286532.

The spelling of 1264720129 in words is "one billion, two hundred sixty-four million, seven hundred twenty thousand, one hundred twenty-nine".