1556226729 has 16 divisors (see below), whose sum is σ = 2354576640. Its totient is φ = 1015409520.

The previous prime is 1556226671. The next prime is 1556226761. The reversal of 1556226729 is 9276226551.

1556226729 is a `hidden beast` number, since 1 + 5 + 562 + 2 + 67 + 29 = 666.

It is not a de Polignac number, because 1556226729 - 2⁸ = 1556226473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1556226769) 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 15 ways as a sum of consecutive naturals, for example, 611902 + ... + 614439.

It is an arithmetic number, because the mean of its divisors is an integer number (147161040).

Almost surely, 2^1556226729 is an apocalyptic number.

It is an amenable number.

1556226729 is a deficient number, since it is larger than the sum of its proper divisors (798349911).

1556226729 is a wasteful number, since it uses less digits than its factorization.

1556226729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226397 (or 1226391 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 1556226729 is about 39449.0396461055. The cubic root of 1556226729 is about 1158.8421683894.

The spelling of 1556226729 in words is "one billion, five hundred fifty-six million, two hundred twenty-six thousand, seven hundred twenty-nine".