20100209489 has 2 divisors, whose sum is σ = 20100209490. Its totient is φ = 20100209488.

The previous prime is 20100209447. The next prime is 20100209501. The reversal of 20100209489 is 98490200102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13280257600 + 6819951889 = 115240^2 + 82583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20100209489 is a prime.

It is a super-2 number, since 2×20100209489² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20100202489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050104744 + 10050104745.

It is an arithmetic number, because the mean of its divisors is an integer number (10050104745).

Almost surely, 2^20100209489 is an apocalyptic number.

It is an amenable number.

20100209489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100209489 is an equidigital number, since it uses as much as digits as its factorization.

20100209489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 20100209489 in words is "twenty billion, one hundred million, two hundred nine thousand, four hundred eighty-nine".