1557142943 has 4 divisors (see below), whose sum is σ = 1558628400. Its totient is φ = 1555657488.

The previous prime is 1557142921. The next prime is 1557142949. The reversal of 1557142943 is 3492417551.

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

It is a cyclic number.

It is not a de Polignac number, because 1557142943 - 2⁶ = 1557142879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1557142943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557142949) 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 3 ways as a sum of consecutive naturals, for example, 741155 + ... + 743252.

It is an arithmetic number, because the mean of its divisors is an integer number (389657100).

Almost surely, 2^1557142943 is an apocalyptic number.

1557142943 is a deficient number, since it is larger than the sum of its proper divisors (1485457).

1557142943 is a wasteful number, since it uses less digits than its factorization.

1557142943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485456.

The product of its digits is 151200, while the sum is 41.

The square root of 1557142943 is about 39460.6505648348. The cubic root of 1557142943 is about 1159.0695429534.

The spelling of 1557142943 in words is "one billion, five hundred fifty-seven million, one hundred forty-two thousand, nine hundred forty-three".