1156542056 has 8 divisors (see below), whose sum is σ = 2168516370. Its totient is φ = 578271024.

The previous prime is 1156542047. The next prime is 1156542071. The reversal of 1156542056 is 6502456511.

It can be written as a sum of positive squares in only one way, i.e., 757900900 + 398641156 = 27530^2 + 19966^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 72283871 + ... + 72283886.

Almost surely, 2^1156542056 is an apocalyptic number.

It is an amenable number.

1156542056 is a deficient number, since it is larger than the sum of its proper divisors (1011974314).

1156542056 is a wasteful number, since it uses less digits than its factorization.

1156542056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144567763 (or 144567759 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 1156542056 is about 34007.9704775219. The cubic root of 1156542056 is about 1049.6724771370.

Adding to 1156542056 its reverse (6502456511), we get a palindrome (7658998567).

The spelling of 1156542056 in words is "one billion, one hundred fifty-six million, five hundred forty-two thousand, fifty-six".