1599540113921 has 4 divisors (see below), whose sum is σ = 1651138182144. Its totient is φ = 1547942045700.

The previous prime is 1599540113917. The next prime is 1599540113939. The reversal of 1599540113921 is 1293110459951.

It is a happy number.

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 1599540113921 - 2² = 1599540113917 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 1599540113921.

It is not an unprimeable number, because it can be changed into a prime (1599540113021) 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, 25799034065 + ... + 25799034126.

It is an arithmetic number, because the mean of its divisors is an integer number (412784545536).

Almost surely, 2^{1599540113921} is an apocalyptic number.

It is an amenable number.

1599540113921 is a deficient number, since it is larger than the sum of its proper divisors (51598068223).

1599540113921 is an equidigital number, since it uses as much as digits as its factorization.

1599540113921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51598068222.

The product of its (nonzero) digits is 437400, while the sum is 50.

The spelling of 1599540113921 in words is "one trillion, five hundred ninety-nine billion, five hundred forty million, one hundred thirteen thousand, nine hundred twenty-one".