1243331145 has 36 divisors (see below), whose sum is σ = 2506966020. Its totient is φ = 568378944.

The previous prime is 1243331137. The next prime is 1243331147. The reversal of 1243331145 is 5411333421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 943902729 + 299428416 = 30723^2 + 17304^2 .

It is not a de Polignac number, because 1243331145 - 2³ = 1243331137 is a prime.

It is a super-2 number, since 2×1243331145² = 3091744672254022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243331147) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 279730 + ... + 284139.

It is an arithmetic number, because the mean of its divisors is an integer number (69637945).

Almost surely, 2^1243331145 is an apocalyptic number.

1243331145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1243331145 is an abundant number, since it is smaller than the sum of its proper divisors (1263634875).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243331145 is a wasteful number, since it uses less digits than its factorization.

1243331145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563894 (or 563884 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1243331145 is about 35260.9010803751. The cubic root of 1243331145 is about 1075.2982464342.

Adding to 1243331145 its reverse (5411333421), we get a palindrome (6654664566).

The spelling of 1243331145 in words is "one billion, two hundred forty-three million, three hundred thirty-one thousand, one hundred forty-five".