1291567555 has 16 divisors (see below), whose sum is σ = 1571149440. Its totient is φ = 1019132928.

The previous prime is 1291567549. The next prime is 1291567559. The reversal of 1291567555 is 5557651921.

It is a cyclic number.

It is not a de Polignac number, because 1291567555 - 2¹¹ = 1291565507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1291567559) 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 in 15 ways as a sum of consecutive naturals, for example, 189334 + ... + 196036.

It is an arithmetic number, because the mean of its divisors is an integer number (98196840).

Almost surely, 2^1291567555 is an apocalyptic number.

1291567555 is a deficient number, since it is larger than the sum of its proper divisors (279581885).

1291567555 is an equidigital number, since it uses as much as digits as its factorization.

1291567555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7230.

The product of its digits is 472500, while the sum is 46.

The square root of 1291567555 is about 35938.3855369158. The cubic root of 1291567555 is about 1089.0279904649.

The spelling of 1291567555 in words is "one billion, two hundred ninety-one million, five hundred sixty-seven thousand, five hundred fifty-five".