1156918649 has 4 divisors (see below), whose sum is σ = 1158141264. Its totient is φ = 1155696036.

The previous prime is 1156918639. The next prime is 1156918691. The reversal of 1156918649 is 9468196511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9468196511 = 37 ⋅255897203.

It is a cyclic number.

It is not a de Polignac number, because 1156918649 - 2¹² = 1156914553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1156918597 and 1156918606.

It is not an unprimeable number, because it can be changed into a prime (1156918639) 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, 609887 + ... + 611780.

It is an arithmetic number, because the mean of its divisors is an integer number (289535316).

Almost surely, 2^1156918649 is an apocalyptic number.

It is an amenable number.

1156918649 is a deficient number, since it is larger than the sum of its proper divisors (1222615).

1156918649 is an equidigital number, since it uses as much as digits as its factorization.

1156918649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222614.

The product of its digits is 466560, while the sum is 50.

The square root of 1156918649 is about 34013.5068612456. The cubic root of 1156918649 is about 1049.7863961560.

The spelling of 1156918649 in words is "one billion, one hundred fifty-six million, nine hundred eighteen thousand, six hundred forty-nine".