1601537520 has 80 divisors (see below), whose sum is σ = 5416117632. Its totient is φ = 388250880.

The previous prime is 1601537501. The next prime is 1601537521. The reversal of 1601537520 is 257351061.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601537521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300682 + ... + 305961.

Almost surely, 2^1601537520 is an apocalyptic number.

1601537520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601537520 is an abundant number, since it is smaller than the sum of its proper divisors (3814580112).

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

1601537520 is a wasteful number, since it uses less digits than its factorization.

1601537520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606670 (or 606664 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 1601537520 is about 40019.2143850926. The cubic root of 1601537520 is about 1169.9816199903.

Adding to 1601537520 its reverse (257351061), we get a palindrome (1858888581).

It can be divided in two parts, 16015 and 37520, that added together give a palindrome (53535).

The spelling of 1601537520 in words is "one billion, six hundred one million, five hundred thirty-seven thousand, five hundred twenty".