1206642001 has 2 divisors, whose sum is σ = 1206642002. Its totient is φ = 1206642000.

The previous prime is 1206641921. The next prime is 1206642007. The reversal of 1206642001 is 1002466021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634284225 + 572357776 = 25185^2 + 23924^2 .

It is an emirp because it is prime and its reverse (1002466021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1206642001 - 2²⁷ = 1072424273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1206642007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603321000 + 603321001.

It is an arithmetic number, because the mean of its divisors is an integer number (603321001).

Almost surely, 2^1206642001 is an apocalyptic number.

It is an amenable number.

1206642001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206642001 is an equidigital number, since it uses as much as digits as its factorization.

1206642001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1206642001 is about 34736.7528850928. The cubic root of 1206642001 is about 1064.6155683029.

The spelling of 1206642001 in words is "one billion, two hundred six million, six hundred forty-two thousand, one".