1556155147 has 4 divisors (see below), whose sum is σ = 1556546176. Its totient is φ = 1555764120.

The previous prime is 1556155141. The next prime is 1556155171. The reversal of 1556155147 is 7415516551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1556155147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1556155141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189483 + ... + 197524.

It is an arithmetic number, because the mean of its divisors is an integer number (389136544).

Almost surely, 2^1556155147 is an apocalyptic number.

1556155147 is a deficient number, since it is larger than the sum of its proper divisors (391029).

1556155147 is an equidigital number, since it uses as much as digits as its factorization.

1556155147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391028.

The product of its digits is 105000, while the sum is 40.

The square root of 1556155147 is about 39448.1323639029. The cubic root of 1556155147 is about 1158.8244003032.

The spelling of 1556155147 in words is "one billion, five hundred fifty-six million, one hundred fifty-five thousand, one hundred forty-seven".