1125542431 has 4 divisors (see below), whose sum is σ = 1212122632. Its totient is φ = 1038962232.

The previous prime is 1125542423. The next prime is 1125542441. The reversal of 1125542431 is 1342455211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1342455211 = 29 ⋅46291559.

It is a cyclic number.

It is not a de Polignac number, because 1125542431 - 2³ = 1125542423 is a prime.

It is a super-2 number, since 2×1125542431² = 2533691527962779522, which contains 22 as substring.

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 1125542431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125542441) 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, 43290081 + ... + 43290106.

It is an arithmetic number, because the mean of its divisors is an integer number (303030658).

Almost surely, 2^1125542431 is an apocalyptic number.

1125542431 is a deficient number, since it is larger than the sum of its proper divisors (86580201).

1125542431 is an equidigital number, since it uses as much as digits as its factorization.

1125542431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86580200.

The product of its digits is 4800, while the sum is 28.

The square root of 1125542431 is about 33549.1047719608. The cubic root of 1125542431 is about 1040.2090405120.

Adding to 1125542431 its reverse (1342455211), we get a palindrome (2467997642).

The spelling of 1125542431 in words is "one billion, one hundred twenty-five million, five hundred forty-two thousand, four hundred thirty-one".