19501020001 has 2 divisors, whose sum is σ = 19501020002. Its totient is φ = 19501020000.

The previous prime is 19501019981. The next prime is 19501020013. The reversal of 19501020001 is 10002010591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12516239376 + 6984780625 = 111876^2 + 83575^2 .

It is a cyclic number.

It is not a de Polignac number, because 19501020001 - 2¹⁷ = 19500888929 is a prime.

It is not a weakly prime, because it can be changed into another prime (19501020031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9750510000 + 9750510001.

It is an arithmetic number, because the mean of its divisors is an integer number (9750510001).

Almost surely, 2^19501020001 is an apocalyptic number.

It is an amenable number.

19501020001 is a deficient number, since it is larger than the sum of its proper divisors (1).

19501020001 is an equidigital number, since it uses as much as digits as its factorization.

19501020001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 19.

Adding to 19501020001 its reverse (10002010591), we get a palindrome (29503030592).

The spelling of 19501020001 in words is "nineteen billion, five hundred one million, twenty thousand, one".