1153221053 has 4 divisors (see below), whose sum is σ = 1154249088. Its totient is φ = 1152193020.

The previous prime is 1153221031. The next prime is 1153221067. The reversal of 1153221053 is 3501223511.

It is a happy number.

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: 3501223511 = 17987 ⋅194653.

It is a cyclic number.

It is not a de Polignac number, because 1153221053 - 2²⁴ = 1136443837 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 (1153223053) 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, 512333 + ... + 514578.

It is an arithmetic number, because the mean of its divisors is an integer number (288562272).

Almost surely, 2^1153221053 is an apocalyptic number.

It is an amenable number.

1153221053 is a deficient number, since it is larger than the sum of its proper divisors (1028035).

1153221053 is a wasteful number, since it uses less digits than its factorization.

1153221053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028034.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1153221053 is about 33959.1085424809. The cubic root of 1153221053 is about 1048.6668046951. Note that the first 3 decimals are identical.

Adding to 1153221053 its reverse (3501223511), we get a palindrome (4654444564).

The spelling of 1153221053 in words is "one billion, one hundred fifty-three million, two hundred twenty-one thousand, fifty-three".