1605131005 has 16 divisors (see below), whose sum is σ = 1995055920. Its totient is φ = 1238282752.

The previous prime is 1605130997. The next prime is 1605131027. The reversal of 1605131005 is 5001315061.

It can be written as a sum of positive squares in 8 ways, for example, as 76790169 + 1528340836 = 8763^2 + 39094^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605131005 - 2³ = 1605130997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117807 + ... + 130723.

It is an arithmetic number, because the mean of its divisors is an integer number (124690995).

Almost surely, 2^1605131005 is an apocalyptic number.

It is an amenable number.

1605131005 is a deficient number, since it is larger than the sum of its proper divisors (389924915).

1605131005 is a wasteful number, since it uses less digits than its factorization.

1605131005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13808.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1605131005 is about 40064.0862244480. The cubic root of 1605131005 is about 1170.8560236509.

Adding to 1605131005 its reverse (5001315061), we get a palindrome (6606446066).

The spelling of 1605131005 in words is "one billion, six hundred five million, one hundred thirty-one thousand, five".