1001722500 has 135 divisors (see below), whose sum is σ = 3179219043. Its totient is φ = 265860000.

The previous prime is 1001722493. The next prime is 1001722511. The reversal of 1001722500 is 52271001.

The square root of 1001722500 is 31650.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 78535044 + 923187456 = 8862^2 + 30384^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 4747395 + ... + 4747605.

Almost surely, 2^1001722500 is an apocalyptic number.

1001722500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1001722500 is the 31650-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001722500

1001722500 is an abundant number, since it is smaller than the sum of its proper divisors (2177496543).

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

1001722500 is an equidigital number, since it uses as much as digits as its factorization.

1001722500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The cubic root of 1001722500 is about 1000.5738373144.

Adding to 1001722500 its reverse (52271001), we get a palindrome (1053993501).

The spelling of 1001722500 in words is "one billion, one million, seven hundred twenty-two thousand, five hundred".