1123072431 has 12 divisors (see below), whose sum is σ = 1621478088. Its totient is φ = 691121184.

The previous prime is 1123072427. The next prime is 1123072439. The reversal of 1123072431 is 1342703211.

It is a happy number.

It is not a de Polignac number, because 1123072431 - 2² = 1123072427 is a prime.

It is a super-2 number, since 2×1123072431² = 2522583370544499522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123072439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1107060 + ... + 1108073.

It is an arithmetic number, because the mean of its divisors is an integer number (135123174).

Almost surely, 2^1123072431 is an apocalyptic number.

1123072431 is a deficient number, since it is larger than the sum of its proper divisors (498405657).

1123072431 is a wasteful number, since it uses less digits than its factorization.

1123072431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215162 (or 2215149 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 1123072431 is about 33512.2728414532. The cubic root of 1123072431 is about 1039.4475711953.

Adding to 1123072431 its reverse (1342703211), we get a palindrome (2465775642).

The spelling of 1123072431 in words is "one billion, one hundred twenty-three million, seventy-two thousand, four hundred thirty-one".