1153251243 has 64 divisors (see below), whose sum is σ = 1813708800. Its totient is φ = 723284640.

The previous prime is 1153251217. The next prime is 1153251247. The reversal of 1153251243 is 3421523511.

1153251243 is a `hidden beast` number, since 1 + 1 + 532 + 5 + 124 + 3 = 666.

It is not a de Polignac number, because 1153251243 - 2⁶ = 1153251179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1153251247) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7075080 + ... + 7075242.

It is an arithmetic number, because the mean of its divisors is an integer number (28339200).

Almost surely, 2^1153251243 is an apocalyptic number.

1153251243 is a deficient number, since it is larger than the sum of its proper divisors (660457557).

1153251243 is a wasteful number, since it uses less digits than its factorization.

1153251243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 383 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1153251243 is about 33959.5530447619. The cubic root of 1153251243 is about 1048.6759555786.

Adding to 1153251243 its reverse (3421523511), we get a palindrome (4574774754).

The spelling of 1153251243 in words is "one billion, one hundred fifty-three million, two hundred fifty-one thousand, two hundred forty-three".