1391358361 has 2 divisors, whose sum is σ = 1391358362. Its totient is φ = 1391358360.

The previous prime is 1391358359. The next prime is 1391358377. The reversal of 1391358361 is 1638531931.

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., 1179510336 + 211848025 = 34344^2 + 14555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391358361 - 2¹ = 1391358359 is a prime.

Together with 1391358359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1391358301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695679180 + 695679181.

It is an arithmetic number, because the mean of its divisors is an integer number (695679181).

Almost surely, 2^1391358361 is an apocalyptic number.

It is an amenable number.

1391358361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391358361 is an equidigital number, since it uses as much as digits as its factorization.

1391358361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 1391358361 is about 37300.9163560361. The cubic root of 1391358361 is about 1116.3824503469.

The spelling of 1391358361 in words is "one billion, three hundred ninety-one million, three hundred fifty-eight thousand, three hundred sixty-one".