1001156225 has 6 divisors (see below), whose sum is σ = 1241433750. Its totient is φ = 800924960.

The previous prime is 1001156201. The next prime is 1001156243. The reversal of 1001156225 is 5226511001.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 40094224 + 961062001 = 6332^2 + 31001^2 .

It is not a de Polignac number, because 1001156225 - 2¹² = 1001152129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001156225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20023100 + ... + 20023149.

It is an arithmetic number, because the mean of its divisors is an integer number (206905625).

Almost surely, 2^1001156225 is an apocalyptic number.

It is an amenable number.

1001156225 is a deficient number, since it is larger than the sum of its proper divisors (240277525).

1001156225 is an equidigital number, since it uses as much as digits as its factorization.

1001156225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40046259 (or 40046254 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1001156225 is about 31641.0528427864. The cubic root of 1001156225 is about 1000.3852598891.

Adding to 1001156225 its reverse (5226511001), we get a palindrome (6227667226).

The spelling of 1001156225 in words is "one billion, one million, one hundred fifty-six thousand, two hundred twenty-five".