1153641221 has 4 divisors (see below), whose sum is σ = 1214359200. Its totient is φ = 1092923244.

The previous prime is 1153641193. The next prime is 1153641227. The reversal of 1153641221 is 1221463511.

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 not a de Polignac number, because 1153641221 - 2¹⁰ = 1153640197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153641227) 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, 30358961 + ... + 30358998.

It is an arithmetic number, because the mean of its divisors is an integer number (303589800).

Almost surely, 2^1153641221 is an apocalyptic number.

It is an amenable number.

1153641221 is a deficient number, since it is larger than the sum of its proper divisors (60717979).

1153641221 is an equidigital number, since it uses as much as digits as its factorization.

1153641221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60717978.

The product of its digits is 1440, while the sum is 26.

The square root of 1153641221 is about 33965.2943605675. The cubic root of 1153641221 is about 1048.7941473619.

The spelling of 1153641221 in words is "one billion, one hundred fifty-three million, six hundred forty-one thousand, two hundred twenty-one".