1610211605 has 4 divisors (see below), whose sum is σ = 1932253932. Its totient is φ = 1288169280.

The previous prime is 1610211541. The next prime is 1610211607. The reversal of 1610211605 is 5061120161.

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 1245172369 + 365039236 = 35287^2 + 19106^2 .

It is not a de Polignac number, because 1610211605 - 2⁶ = 1610211541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1610211607) 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, 161021156 + ... + 161021165.

It is an arithmetic number, because the mean of its divisors is an integer number (483063483).

Almost surely, 2^1610211605 is an apocalyptic number.

It is an amenable number.

1610211605 is a deficient number, since it is larger than the sum of its proper divisors (322042327).

1610211605 is an equidigital number, since it uses as much as digits as its factorization.

1610211605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322042326.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 1610211605 is about 40127.4420440675. The cubic root of 1610211605 is about 1172.0900632893.

Adding to 1610211605 its reverse (5061120161), we get a palindrome (6671331766).

The spelling of 1610211605 in words is "one billion, six hundred ten million, two hundred eleven thousand, six hundred five".