1155745221 has 8 divisors (see below), whose sum is σ = 1631640384. Its totient is φ = 725173440.

The previous prime is 1155745211. The next prime is 1155745229. The reversal of 1155745221 is 1225475511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1155745221 - 2⁷ = 1155745093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155745229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11330785 + ... + 11330886.

It is an arithmetic number, because the mean of its divisors is an integer number (203955048).

Almost surely, 2^1155745221 is an apocalyptic number.

It is an amenable number.

1155745221 is a deficient number, since it is larger than the sum of its proper divisors (475895163).

1155745221 is a wasteful number, since it uses less digits than its factorization.

1155745221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22661691.

The product of its digits is 14000, while the sum is 33.

The square root of 1155745221 is about 33996.2530435341. The cubic root of 1155745221 is about 1049.4313537731.

The spelling of 1155745221 in words is "one billion, one hundred fifty-five million, seven hundred forty-five thousand, two hundred twenty-one".