1599949121 has 4 divisors (see below), whose sum is σ = 1601305044. Its totient is φ = 1598593200.

The previous prime is 1599949097. The next prime is 1599949133. The reversal of 1599949121 is 1219499951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1370850625 + 229098496 = 37025^2 + 15136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1599949121 - 2²² = 1595754817 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 1599949121.

It is not an unprimeable number, because it can be changed into a prime (1599949151) 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, 676190 + ... + 678551.

It is an arithmetic number, because the mean of its divisors is an integer number (400326261).

Almost surely, 2^1599949121 is an apocalyptic number.

It is an amenable number.

1599949121 is a deficient number, since it is larger than the sum of its proper divisors (1355923).

1599949121 is a wasteful number, since it uses less digits than its factorization.

1599949121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355922.

The product of its digits is 262440, while the sum is 50.

The square root of 1599949121 is about 39999.3640074439. The cubic root of 1599949121 is about 1169.5946975622.

The spelling of 1599949121 in words is "one billion, five hundred ninety-nine million, nine hundred forty-nine thousand, one hundred twenty-one".