209276681137 has 2 divisors, whose sum is σ = 209276681138. Its totient is φ = 209276681136.

The previous prime is 209276681083. The next prime is 209276681161. The reversal of 209276681137 is 731186672902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196354448161 + 12922232976 = 443119^2 + 113676^2 .

It is a cyclic number.

It is not a de Polignac number, because 209276681137 - 2¹⁵ = 209276648369 is a prime.

It is a super-2 number, since 2×209276681137² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209276681437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104638340568 + 104638340569.

It is an arithmetic number, because the mean of its divisors is an integer number (104638340569).

Almost surely, 2^209276681137 is an apocalyptic number.

It is an amenable number.

209276681137 is a deficient number, since it is larger than the sum of its proper divisors (1).

209276681137 is an equidigital number, since it uses as much as digits as its factorization.

209276681137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 209276681137 in words is "two hundred nine billion, two hundred seventy-six million, six hundred eighty-one thousand, one hundred thirty-seven".