209454336061 has 2 divisors, whose sum is σ = 209454336062. Its totient is φ = 209454336060.

The previous prime is 209454335941. The next prime is 209454336109. The reversal of 209454336061 is 160633454902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195001728100 + 14452607961 = 441590^2 + 120219^2 .

It is a cyclic number.

It is not a de Polignac number, because 209454336061 - 2³³ = 200864401469 is a prime.

It is a super-2 number, since 2×209454336061² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209454335999 and 209454336017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209454336761) 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, 104727168030 + 104727168031.

It is an arithmetic number, because the mean of its divisors is an integer number (104727168031).

Almost surely, 2^209454336061 is an apocalyptic number.

It is an amenable number.

209454336061 is a deficient number, since it is larger than the sum of its proper divisors (1).

209454336061 is an equidigital number, since it uses as much as digits as its factorization.

209454336061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 209454336061 in words is "two hundred nine billion, four hundred fifty-four million, three hundred thirty-six thousand, sixty-one".