1243542545 has 8 divisors (see below), whose sum is σ = 1705429824. Its totient is φ = 852714864.

The previous prime is 1243542479. The next prime is 1243542589. The reversal of 1243542545 is 5452453421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243542545 - 2¹² = 1243538449 is a prime.

It is a super-2 number, since 2×1243542545² = 3092796122450154050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 35529787 = 1243542545 / (1 + 2 + 4 + 3 + 5 + 4 + 2 + 5 + 4 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17764859 + ... + 17764928.

It is an arithmetic number, because the mean of its divisors is an integer number (213178728).

Almost surely, 2^1243542545 is an apocalyptic number.

It is an amenable number.

1243542545 is a deficient number, since it is larger than the sum of its proper divisors (461887279).

1243542545 is an equidigital number, since it uses as much as digits as its factorization.

1243542545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35529799.

The product of its digits is 96000, while the sum is 35.

The square root of 1243542545 is about 35263.8986074994. The cubic root of 1243542545 is about 1075.3591862646.

Adding to 1243542545 its reverse (5452453421), we get a palindrome (6695995966).

The spelling of 1243542545 in words is "one billion, two hundred forty-three million, five hundred forty-two thousand, five hundred forty-five".