1243045531 has 48 divisors (see below), whose sum is σ = 1675987200. Its totient is φ = 899144064.

The previous prime is 1243045523. The next prime is 1243045543. The reversal of 1243045531 is 1355403421.

It is not a de Polignac number, because 1243045531 - 2³ = 1243045523 is a prime.

It is a super-2 number, since 2×1243045531² = 3090324384278143922, 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 1243045531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243045561) 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 47 ways as a sum of consecutive naturals, for example, 650880 + ... + 652786.

It is an arithmetic number, because the mean of its divisors is an integer number (34916400).

Almost surely, 2^1243045531 is an apocalyptic number.

1243045531 is a deficient number, since it is larger than the sum of its proper divisors (432941669).

1243045531 is a wasteful number, since it uses less digits than its factorization.

1243045531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1243045531 is about 35256.8508378159. The cubic root of 1243045531 is about 1075.2159021195.

Adding to 1243045531 its reverse (1355403421), we get a palindrome (2598448952).

The spelling of 1243045531 in words is "one billion, two hundred forty-three million, forty-five thousand, five hundred thirty-one".