1556135542 has 16 divisors (see below), whose sum is σ = 2549165472. Its totient is φ = 708099840.

The previous prime is 1556135531. The next prime is 1556135591. The reversal of 1556135542 is 2455316551.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 419643 + ... + 423334.

It is an arithmetic number, because the mean of its divisors is an integer number (159322842).

Almost surely, 2^1556135542 is an apocalyptic number.

1556135542 is a deficient number, since it is larger than the sum of its proper divisors (993029930).

1556135542 is a wasteful number, since it uses less digits than its factorization.

1556135542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843063.

The product of its digits is 90000, while the sum is 37.

The square root of 1556135542 is about 39447.8838722687. The cubic root of 1556135542 is about 1158.8195338545.

The spelling of 1556135542 in words is "one billion, five hundred fifty-six million, one hundred thirty-five thousand, five hundred forty-two".