1368573521 has 4 divisors (see below), whose sum is σ = 1564084032. Its totient is φ = 1173063012.

The previous prime is 1368573469. The next prime is 1368573527. The reversal of 1368573521 is 1253758631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1368573521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1368573527) 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 3 ways as a sum of consecutive naturals, for example, 97755245 + ... + 97755258.

It is an arithmetic number, because the mean of its divisors is an integer number (391021008).

Almost surely, 2^1368573521 is an apocalyptic number.

It is an amenable number.

1368573521 is a deficient number, since it is larger than the sum of its proper divisors (195510511).

1368573521 is an equidigital number, since it uses as much as digits as its factorization.

1368573521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195510510.

The product of its digits is 151200, while the sum is 41.

The square root of 1368573521 is about 36994.2363213515. The cubic root of 1368573521 is about 1110.2549318415.

The spelling of 1368573521 in words is "one billion, three hundred sixty-eight million, five hundred seventy-three thousand, five hundred twenty-one".