1243533601 has 8 divisors (see below), whose sum is σ = 1305616320. Its totient is φ = 1182731088.

The previous prime is 1243533553. The next prime is 1243533631. The reversal of 1243533601 is 1063353421.

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 1243533601 - 2²³ = 1235144993 is a prime.

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 1243533601.

It is not an unprimeable number, because it can be changed into a prime (1243533631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318061 + ... + 321946.

It is an arithmetic number, because the mean of its divisors is an integer number (163202040).

Almost surely, 2^1243533601 is an apocalyptic number.

It is an amenable number.

1243533601 is a deficient number, since it is larger than the sum of its proper divisors (62082719).

1243533601 is an equidigital number, since it uses as much as digits as its factorization.

1243533601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640103.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 1243533601 is about 35263.7717920247. The cubic root of 1243533601 is about 1075.3566081366.

The spelling of 1243533601 in words is "one billion, two hundred forty-three million, five hundred thirty-three thousand, six hundred one".