1368835521 has 4 divisors (see below), whose sum is σ = 1825114032. Its totient is φ = 912557012.

The previous prime is 1368835511. The next prime is 1368835549. The reversal of 1368835521 is 1255388631.

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 not a de Polignac number, because 1368835521 - 2⁹ = 1368835009 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1368835511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228139251 + ... + 228139256.

It is an arithmetic number, because the mean of its divisors is an integer number (456278508).

Almost surely, 2^1368835521 is an apocalyptic number.

It is an amenable number.

1368835521 is a deficient number, since it is larger than the sum of its proper divisors (456278511).

1368835521 is an equidigital number, since it uses as much as digits as its factorization.

1368835521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456278510.

The product of its digits is 172800, while the sum is 42.

The square root of 1368835521 is about 36997.7772440454. Note that the first 3 decimals coincide. The cubic root of 1368835521 is about 1110.3257764661.

The spelling of 1368835521 in words is "one billion, three hundred sixty-eight million, eight hundred thirty-five thousand, five hundred twenty-one".