1610005121 has 4 divisors (see below), whose sum is σ = 1610732244. Its totient is φ = 1609278000.

The previous prime is 1610005099. The next prime is 1610005123. The reversal of 1610005121 is 1215000161.

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 1411054096 + 198951025 = 37564^2 + 14105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1610005121 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 1610005121.

It is not an unprimeable number, because it can be changed into a prime (1610005123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360230 + ... + 364671.

It is an arithmetic number, because the mean of its divisors is an integer number (402683061).

Almost surely, 2^1610005121 is an apocalyptic number.

It is an amenable number.

1610005121 is a deficient number, since it is larger than the sum of its proper divisors (727123).

1610005121 is an equidigital number, since it uses as much as digits as its factorization.

1610005121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727122.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1610005121 is about 40124.8691088208. The cubic root of 1610005121 is about 1172.0399605182.

Adding to 1610005121 its reverse (1215000161), we get a palindrome (2825005282).

The spelling of 1610005121 in words is "one billion, six hundred ten million, five thousand, one hundred twenty-one".