1156530013 has 4 divisors (see below), whose sum is σ = 1178351388. Its totient is φ = 1134708640.

The previous prime is 1156529993. The next prime is 1156530031. The reversal of 1156530013 is 3100356511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3100356511 = 7 ⋅442908073.

It can be written as a sum of positive squares in 2 ways, for example, as 888814969 + 267715044 = 29813^2 + 16362^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156530013 - 2¹⁷ = 1156398941 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 1156530013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156530073) 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, 10910608 + ... + 10910713.

It is an arithmetic number, because the mean of its divisors is an integer number (294587847).

Almost surely, 2^1156530013 is an apocalyptic number.

It is an amenable number.

1156530013 is a deficient number, since it is larger than the sum of its proper divisors (21821375).

1156530013 is an equidigital number, since it uses as much as digits as its factorization.

1156530013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21821374.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 1156530013 is about 34007.7934156275. The cubic root of 1156530013 is about 1049.6688337331.

Adding to 1156530013 its reverse (3100356511), we get a palindrome (4256886524).

The spelling of 1156530013 in words is "one billion, one hundred fifty-six million, five hundred thirty thousand, thirteen".