1601501605 has 32 divisors (see below), whose sum is σ = 2143065600. Its totient is φ = 1139073600.

The previous prime is 1601501591. The next prime is 1601501651. The reversal of 1601501605 is 5061051061.

It is a de Polignac number, because none of the positive numbers 2^k-1601501605 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1601501605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 683526 + ... + 685864.

It is an arithmetic number, because the mean of its divisors is an integer number (66970800).

Almost surely, 2^1601501605 is an apocalyptic number.

It is an amenable number.

1601501605 is a deficient number, since it is larger than the sum of its proper divisors (541563995).

1601501605 is a wasteful number, since it uses less digits than its factorization.

1601501605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1601501605 is about 40018.7656606248. The cubic root of 1601501605 is about 1169.9728741854.

Adding to 1601501605 its reverse (5061051061), we get a palindrome (6662552666).

The spelling of 1601501605 in words is "one billion, six hundred one million, five hundred one thousand, six hundred five".