1001561201 has 4 divisors (see below), whose sum is σ = 1002200304. Its totient is φ = 1000922100.

The previous prime is 1001561191. The next prime is 1001561207. The reversal of 1001561201 is 1021651001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001561201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001561201.

It is not an unprimeable number, because it can be changed into a prime (1001561207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317195 + ... + 320336.

It is an arithmetic number, because the mean of its divisors is an integer number (250550076).

Almost surely, 2^1001561201 is an apocalyptic number.

It is an amenable number.

1001561201 is a deficient number, since it is larger than the sum of its proper divisors (639103).

1001561201 is an equidigital number, since it uses as much as digits as its factorization.

1001561201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639102.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1001561201 is about 31647.4517299577. The cubic root of 1001561201 is about 1000.5201297515.

The spelling of 1001561201 in words is "one billion, one million, five hundred sixty-one thousand, two hundred one".