1201662001 has 4 divisors (see below), whose sum is σ = 1212296292. Its totient is φ = 1191027712.

The previous prime is 1201661977. The next prime is 1201662023. The reversal of 1201662001 is 1002661021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 227285776 + 974376225 = 15076^2 + 31215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201662001 - 2¹⁹ = 1201137713 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 1201662001.

It is not an unprimeable number, because it can be changed into a prime (1201602001) 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, 5316976 + ... + 5317201.

It is an arithmetic number, because the mean of its divisors is an integer number (303074073).

Almost surely, 2^1201662001 is an apocalyptic number.

It is an amenable number.

1201662001 is a deficient number, since it is larger than the sum of its proper divisors (10634291).

1201662001 is a wasteful number, since it uses less digits than its factorization.

1201662001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10634290.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1201662001 is about 34664.9967690753. The cubic root of 1201662001 is about 1063.1489372002.

The spelling of 1201662001 in words is "one billion, two hundred one million, six hundred sixty-two thousand, one".