1212001001 has 2 divisors, whose sum is σ = 1212001002. Its totient is φ = 1212001000.

The previous prime is 1212000991. The next prime is 1212001003. The reversal of 1212001001 is 1001002121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 816587776 + 395413225 = 28576^2 + 19885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212001001 is a prime.

Together with 1212001003, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212001001.

It is not a weakly prime, because it can be changed into another prime (1212001003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606000500 + 606000501.

It is an arithmetic number, because the mean of its divisors is an integer number (606000501).

Almost surely, 2^1212001001 is an apocalyptic number.

It is an amenable number.

1212001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212001001 is an equidigital number, since it uses as much as digits as its factorization.

1212001001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1212001001 is about 34813.8047475423. The cubic root of 1212001001 is about 1066.1893157823.

Adding to 1212001001 its reverse (1001002121), we get a palindrome (2213003122).

The spelling of 1212001001 in words is "one billion, two hundred twelve million, one thousand, one".