1000219901 has 2 divisors, whose sum is σ = 1000219902. Its totient is φ = 1000219900.

The previous prime is 1000219897. The next prime is 1000219903. The reversal of 1000219901 is 1099120001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 727111225 + 273108676 = 26965^2 + 16526^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000219901 - 2² = 1000219897 is a prime.

Together with 1000219903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000219903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500109950 + 500109951.

It is an arithmetic number, because the mean of its divisors is an integer number (500109951).

Almost surely, 2^1000219901 is an apocalyptic number.

It is an amenable number.

1000219901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000219901 is an equidigital number, since it uses as much as digits as its factorization.

1000219901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1000219901 is about 31626.2533506579. The cubic root of 1000219901 is about 1000.0732949611.

Adding to 1000219901 its reverse (1099120001), we get a palindrome (2099339902).

The spelling of 1000219901 in words is "one billion, two hundred nineteen thousand, nine hundred one".