1156221617 has 4 divisors (see below), whose sum is σ = 1156953600. Its totient is φ = 1155489636.

The previous prime is 1156221587. The next prime is 1156221631. The reversal of 1156221617 is 7161226511.

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.

It is a cyclic number.

It is not a de Polignac number, because 1156221617 - 2¹⁶ = 1156156081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156221637) 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, 363617 + ... + 366782.

It is an arithmetic number, because the mean of its divisors is an integer number (289238400).

Almost surely, 2^1156221617 is an apocalyptic number.

It is an amenable number.

1156221617 is a deficient number, since it is larger than the sum of its proper divisors (731983).

1156221617 is an equidigital number, since it uses as much as digits as its factorization.

1156221617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731982.

The product of its digits is 5040, while the sum is 32.

The square root of 1156221617 is about 34003.2589173450. The cubic root of 1156221617 is about 1049.5755251740.

The spelling of 1156221617 in words is "one billion, one hundred fifty-six million, two hundred twenty-one thousand, six hundred seventeen".