1215001001 has 2 divisors, whose sum is σ = 1215001002. Its totient is φ = 1215001000.

The previous prime is 1215000979. The next prime is 1215001003. The reversal of 1215001001 is 1001005121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1064325376 + 150675625 = 32624^2 + 12275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215001001 - 2¹⁰ = 1214999977 is a prime.

Together with 1215001003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1215001003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607500500 + 607500501.

It is an arithmetic number, because the mean of its divisors is an integer number (607500501).

Almost surely, 2^1215001001 is an apocalyptic number.

It is an amenable number.

1215001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215001001 is an equidigital number, since it uses as much as digits as its factorization.

1215001001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10, while the sum is 11.

The square root of 1215001001 is about 34856.8644745909. The cubic root of 1215001001 is about 1067.0682843881.

Adding to 1215001001 its reverse (1001005121), we get a palindrome (2216006122).

The spelling of 1215001001 in words is "one billion, two hundred fifteen million, one thousand, one".