1206520001 has 4 divisors (see below), whose sum is σ = 1206683604. Its totient is φ = 1206356400.

The previous prime is 1206519989. The next prime is 1206520009. The reversal of 1206520001 is 1000256021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1000256021 = 47 ⋅21282043.

It can be written as a sum of positive squares in 2 ways, for example, as 806560000 + 399960001 = 28400^2 + 19999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1206520001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1206520009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70190 + ... + 85671.

It is an arithmetic number, because the mean of its divisors is an integer number (301670901).

Almost surely, 2^1206520001 is an apocalyptic number.

It is an amenable number.

1206520001 is a deficient number, since it is larger than the sum of its proper divisors (163603).

1206520001 is an equidigital number, since it uses as much as digits as its factorization.

1206520001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163602.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1206520001 is about 34734.9967755864. The cubic root of 1206520001 is about 1064.5796870509.

Adding to 1206520001 its reverse (1000256021), we get a palindrome (2206776022).

The spelling of 1206520001 in words is "one billion, two hundred six million, five hundred twenty thousand, one".