209023078946449 has 2 divisors, whose sum is σ = 209023078946450. Its totient is φ = 209023078946448.

The previous prime is 209023078946419. The next prime is 209023078946459. The reversal of 209023078946449 is 944649870320902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122067584496400 + 86955494450049 = 11048420^2 + 9324993^2 .

It is a cyclic number.

It is not a de Polignac number, because 209023078946449 - 2¹⁹ = 209023078422161 is a prime.

It is not a weakly prime, because it can be changed into another prime (209023078946419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104511539473224 + 104511539473225.

It is an arithmetic number, because the mean of its divisors is an integer number (104511539473225).

Almost surely, 2^{209023078946449} is an apocalyptic number.

It is an amenable number.

209023078946449 is a deficient number, since it is larger than the sum of its proper divisors (1).

209023078946449 is an equidigital number, since it uses as much as digits as its factorization.

209023078946449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 188116992, while the sum is 67.

The spelling of 209023078946449 in words is "two hundred nine trillion, twenty-three billion, seventy-eight million, nine hundred forty-six thousand, four hundred forty-nine".