1293788161 has 2 divisors, whose sum is σ = 1293788162. Its totient is φ = 1293788160.

The previous prime is 1293788159. The next prime is 1293788183. The reversal of 1293788161 is 1618873921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1153009936 + 140778225 = 33956^2 + 11865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1293788161 - 2¹ = 1293788159 is a prime.

Together with 1293788159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1293788191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 646894080 + 646894081.

It is an arithmetic number, because the mean of its divisors is an integer number (646894081).

Almost surely, 2^1293788161 is an apocalyptic number.

It is an amenable number.

1293788161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1293788161 is an equidigital number, since it uses as much as digits as its factorization.

1293788161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 46.

The square root of 1293788161 is about 35969.2668955040. The cubic root of 1293788161 is about 1089.6517589662.

The spelling of 1293788161 in words is "one billion, two hundred ninety-three million, seven hundred eighty-eight thousand, one hundred sixty-one".