1556040129 has 12 divisors (see below), whose sum is σ = 2413450224. Its totient is φ = 889165704.

The previous prime is 1556040119. The next prime is 1556040149. The reversal of 1556040129 is 9210406551.

It is not a de Polignac number, because 1556040129 - 2¹³ = 1556031937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1556040129.

It is not an unprimeable number, because it can be changed into a prime (1556040119) 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 11 ways as a sum of consecutive naturals, for example, 5292507 + ... + 5292800.

It is an arithmetic number, because the mean of its divisors is an integer number (201120852).

Almost surely, 2^1556040129 is an apocalyptic number.

It is an amenable number.

1556040129 is a deficient number, since it is larger than the sum of its proper divisors (857410095).

1556040129 is a wasteful number, since it uses less digits than its factorization.

1556040129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10585324 (or 10585317 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1556040129 is about 39446.6744986190. The cubic root of 1556040129 is about 1158.7958493906.

The spelling of 1556040129 in words is "one billion, five hundred fifty-six million, forty thousand, one hundred twenty-nine".