2001801522 has 32 divisors (see below), whose sum is σ = 4583614464. Its totient is φ = 570934800.

The previous prime is 2001801499. The next prime is 2001801523. The reversal of 2001801522 is 2251081002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2001801523) 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, 17754 + ... + 65717.

It is an arithmetic number, because the mean of its divisors is an integer number (143237952).

Almost surely, 2^2001801522 is an apocalyptic number.

2001801522 is an abundant number, since it is smaller than the sum of its proper divisors (2581812942).

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

2001801522 is a wasteful number, since it uses less digits than its factorization.

2001801522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84054.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 2001801522 is about 44741.4966446139. The cubic root of 2001801522 is about 1260.2992322819.

Adding to 2001801522 its reverse (2251081002), we get a palindrome (4252882524).

The spelling of 2001801522 in words is "two billion, one million, eight hundred one thousand, five hundred twenty-two".