209095412381 has 2 divisors, whose sum is σ = 209095412382. Its totient is φ = 209095412380.

The previous prime is 209095412359. The next prime is 209095412399. The reversal of 209095412381 is 183214590902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207138765625 + 1956646756 = 455125^2 + 44234^2 .

It is a cyclic number.

It is not a de Polignac number, because 209095412381 - 2¹⁸ = 209095150237 is a prime.

It is a super-2 number, since 2×209095412381² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209095412311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104547706190 + 104547706191.

It is an arithmetic number, because the mean of its divisors is an integer number (104547706191).

Almost surely, 2^209095412381 is an apocalyptic number.

It is an amenable number.

209095412381 is a deficient number, since it is larger than the sum of its proper divisors (1).

209095412381 is an equidigital number, since it uses as much as digits as its factorization.

209095412381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 209095412381 in words is "two hundred nine billion, ninety-five million, four hundred twelve thousand, three hundred eighty-one".