1605231656 has 16 divisors (see below), whose sum is σ = 3439782240. Its totient is φ = 687956400.

The previous prime is 1605231637. The next prime is 1605231671. The reversal of 1605231656 is 6561325061.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14332370 + ... + 14332481.

It is an arithmetic number, because the mean of its divisors is an integer number (214986390).

Almost surely, 2^1605231656 is an apocalyptic number.

It is an amenable number.

1605231656 is an abundant number, since it is smaller than the sum of its proper divisors (1834550584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1605231656 is a wasteful number, since it uses less digits than its factorization.

1605231656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28664864 (or 28664860 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1605231656 is about 40065.3423297493. The cubic root of 1605231656 is about 1170.8804962882.

The spelling of 1605231656 in words is "one billion, six hundred five million, two hundred thirty-one thousand, six hundred fifty-six".