209651141671 has 2 divisors, whose sum is σ = 209651141672. Its totient is φ = 209651141670.

The previous prime is 209651141659. The next prime is 209651141681. The reversal of 209651141671 is 176141156902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209651141671 - 2¹⁵ = 209651108903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209651141681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104825570835 + 104825570836.

It is an arithmetic number, because the mean of its divisors is an integer number (104825570836).

Almost surely, 2^209651141671 is an apocalyptic number.

209651141671 is a deficient number, since it is larger than the sum of its proper divisors (1).

209651141671 is an equidigital number, since it uses as much as digits as its factorization.

209651141671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 209651141671 in words is "two hundred nine billion, six hundred fifty-one million, one hundred forty-one thousand, six hundred seventy-one".