1001562500 has 54 divisors (see below), whose sum is σ = 2194334814. Its totient is φ = 400000000.

The previous prime is 1001562491. The next prime is 1001562511. The reversal of 1001562500 is 52651001.

It can be written as a sum of positive squares in 9 ways, for example, as 559890244 + 441672256 = 23662^2 + 21016^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1562180 + ... + 1562820.

Almost surely, 2^1001562500 is an apocalyptic number.

1001562500 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 1001562500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097167407).

1001562500 is an abundant number, since it is smaller than the sum of its proper divisors (1192772314).

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

1001562500 is an frugal number, since it uses more digits than its factorization.

1001562500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 648 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1001562500 is about 31647.4722529304. The cubic root of 1001562500 is about 1000.5205623012.

It can be divided in two parts, 100 and 1562500, that multiplied together give a square (156250000 = 12500²).

The spelling of 1001562500 in words is "one billion, one million, five hundred sixty-two thousand, five hundred".