1243042545 has 16 divisors (see below), whose sum is σ = 1991146752. Its totient is φ = 662196480.

The previous prime is 1243042543. The next prime is 1243042547. The reversal of 1243042545 is 5452403421.

It is an interprime number because it is at equal distance from previous prime (1243042543) and next prime (1243042547).

It is not a de Polignac number, because 1243042545 - 2¹ = 1243042543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243042543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33817 + ... + 60246.

It is an arithmetic number, because the mean of its divisors is an integer number (124446672).

Almost surely, 2^1243042545 is an apocalyptic number.

1243042545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1243042545 is a deficient number, since it is larger than the sum of its proper divisors (748104207).

1243042545 is an equidigital number, since it uses as much as digits as its factorization.

1243042545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94952.

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 1243042545 is about 35256.8084914106. The cubic root of 1243042545 is about 1075.2150411703.

Adding to 1243042545 its reverse (5452403421), we get a palindrome (6695445966).

The spelling of 1243042545 in words is "one billion, two hundred forty-three million, forty-two thousand, five hundred forty-five".