1156538043 has 24 divisors (see below), whose sum is σ = 1689442560. Its totient is φ = 762359040.

The previous prime is 1156538039. The next prime is 1156538057. The reversal of 1156538043 is 3408356511.

1156538043 is a `hidden beast` number, since 11 + 565 + 3 + 80 + 4 + 3 = 666.

It is not a de Polignac number, because 1156538043 - 2² = 1156538039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1156537989 and 1156538007.

It is not an unprimeable number, because it can be changed into a prime (1156538023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 295443 + ... + 299331.

It is an arithmetic number, because the mean of its divisors is an integer number (70393440).

Almost surely, 2^1156538043 is an apocalyptic number.

1156538043 is a deficient number, since it is larger than the sum of its proper divisors (532904517).

1156538043 is a wasteful number, since it uses less digits than its factorization.

1156538043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259 (or 4256 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1156538043 is about 34007.9114765961. The cubic root of 1156538043 is about 1049.6712630753.

The spelling of 1156538043 in words is "one billion, one hundred fifty-six million, five hundred thirty-eight thousand, forty-three".