169361279981 has 2 divisors, whose sum is σ = 169361279982. Its totient is φ = 169361279980.

The previous prime is 169361279947. The next prime is 169361279987. The reversal of 169361279981 is 189972163961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93477559081 + 75883720900 = 305741^2 + 275470^2 .

It is a cyclic number.

It is not a de Polignac number, because 169361279981 - 2⁶ = 169361279917 is a prime.

It is a super-2 number, since 2×169361279981² (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 (169361279987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84680639990 + 84680639991.

It is an arithmetic number, because the mean of its divisors is an integer number (84680639991).

Almost surely, 2^169361279981 is an apocalyptic number.

It is an amenable number.

169361279981 is a deficient number, since it is larger than the sum of its proper divisors (1).

169361279981 is an equidigital number, since it uses as much as digits as its factorization.

169361279981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 62.

The spelling of 169361279981 in words is "one hundred sixty-nine billion, three hundred sixty-one million, two hundred seventy-nine thousand, nine hundred eighty-one".