1155224521 has 8 divisors (see below), whose sum is σ = 1267978464. Its totient is φ = 1043759520.

The previous prime is 1155224501. The next prime is 1155224533. The reversal of 1155224521 is 1254225511.

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

It is a cyclic number.

It is not a de Polignac number, because 1155224521 - 2⁹ = 1155224009 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 1155224521.

It is not an unprimeable number, because it can be changed into a prime (1155224501) 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, 320356 + ... + 323941.

It is an arithmetic number, because the mean of its divisors is an integer number (158497308).

Almost surely, 2^1155224521 is an apocalyptic number.

1155224521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1155224521 is a deficient number, since it is larger than the sum of its proper divisors (112753943).

1155224521 is a wasteful number, since it uses less digits than its factorization.

1155224521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644471.

The product of its digits is 4000, while the sum is 28.

The square root of 1155224521 is about 33988.5939838646. The cubic root of 1155224521 is about 1049.2737293592.

The spelling of 1155224521 in words is "one billion, one hundred fifty-five million, two hundred twenty-four thousand, five hundred twenty-one".