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20401010009 is a prime number
BaseRepresentation
bin10010111111111111…
…101011010101011001
31221122210002200120022
4102333333223111121
5313240124310014
613212212240225
71321361503202
oct227777532531
957583080508
1020401010009
118719924856
123b54310075
131c017b0b73
14db76705a9
157e607da8e
hex4bffeb559

20401010009 has 2 divisors, whose sum is σ = 20401010010. Its totient is φ = 20401010008.

The previous prime is 20401009991. The next prime is 20401010059. The reversal of 20401010009 is 90001010402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16630681600 + 3770328409 = 128960^2 + 61403^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401010009 - 212 = 20401005913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20401010059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200505004 + 10200505005.

It is an arithmetic number, because the mean of its divisors is an integer number (10200505005).

Almost surely, 220401010009 is an apocalyptic number.

It is an amenable number.

20401010009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401010009 is an equidigital number, since it uses as much as digits as its factorization.

20401010009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 20401010009 in words is "twenty billion, four hundred one million, ten thousand, nine".