1153221231 has 16 divisors (see below), whose sum is σ = 1632290400. Its totient is φ = 721717248.

The previous prime is 1153221229. The next prime is 1153221233. The reversal of 1153221231 is 1321223511.

It is an interprime number because it is at equal distance from previous prime (1153221229) and next prime (1153221233).

It is not a de Polignac number, because 1153221231 - 2¹ = 1153221229 is a prime.

It is a super-2 number, since 2×1153221231² = 2659838415258310722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1153221198 and 1153221207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153221233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9226 + ... + 48903.

It is an arithmetic number, because the mean of its divisors is an integer number (102018150).

Almost surely, 2^1153221231 is an apocalyptic number.

1153221231 is a deficient number, since it is larger than the sum of its proper divisors (479069169).

1153221231 is a wasteful number, since it uses less digits than its factorization.

1153221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58538.

The product of its digits is 360, while the sum is 21.

The square root of 1153221231 is about 33959.1111632799. Note that the first 4 decimals coincide. The cubic root of 1153221231 is about 1048.6668586491. Note that the first 3 decimals are identical.

Adding to 1153221231 its reverse (1321223511), we get a palindrome (2474444742).

The spelling of 1153221231 in words is "one billion, one hundred fifty-three million, two hundred twenty-one thousand, two hundred thirty-one".