1901522500 has 120 divisors (see below), whose sum is σ = 4353525176. Its totient is φ = 725760000.

The previous prime is 1901522473. The next prime is 1901522503. The reversal of 1901522500 is 52251091.

It can be written as a sum of positive squares in 20 ways, for example, as 1887728704 + 13793796 = 43448^2 + 3714^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1901522503) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5642332 + ... + 5642668.

Almost surely, 2^1901522500 is an apocalyptic number.

1901522500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1901522500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2176762588).

1901522500 is an abundant number, since it is smaller than the sum of its proper divisors (2452002676).

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

1901522500 is a wasteful number, since it uses less digits than its factorization.

1901522500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 442 counting only the distinct ones).

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

The square root of 1901522500 is about 43606.4502109493. The cubic root of 1901522500 is about 1238.8930678210.

Adding to 1901522500 its reverse (52251091), we get a palindrome (1953773591).

The spelling of 1901522500 in words is "one billion, nine hundred one million, five hundred twenty-two thousand, five hundred".