1156645043 has 4 divisors (see below), whose sum is σ = 1181254560. Its totient is φ = 1132035528.

The previous prime is 1156645013. The next prime is 1156645067. The reversal of 1156645043 is 3405466511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3405466511 = 83 ⋅41029717.

It is a cyclic number.

It is not a de Polignac number, because 1156645043 - 2¹⁶ = 1156579507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1156644994 and 1156645012.

It is not an unprimeable number, because it can be changed into a prime (1156645013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12304688 + ... + 12304781.

It is an arithmetic number, because the mean of its divisors is an integer number (295313640).

Almost surely, 2^1156645043 is an apocalyptic number.

1156645043 is a deficient number, since it is larger than the sum of its proper divisors (24609517).

1156645043 is an equidigital number, since it uses as much as digits as its factorization.

1156645043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24609516.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1156645043 is about 34009.4846035632. The cubic root of 1156645043 is about 1049.7036330615.

The spelling of 1156645043 in words is "one billion, one hundred fifty-six million, six hundred forty-five thousand, forty-three".