1361239639 has 2 divisors, whose sum is σ = 1361239640. Its totient is φ = 1361239638.

The previous prime is 1361239637. The next prime is 1361239661. The reversal of 1361239639 is 9369321631.

It is a weak prime.

It is an emirp because it is prime and its reverse (9369321631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1361239639 - 2¹ = 1361239637 is a prime.

Together with 1361239637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1361239595 and 1361239604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1361239637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680619819 + 680619820.

It is an arithmetic number, because the mean of its divisors is an integer number (680619820).

Almost surely, 2^1361239639 is an apocalyptic number.

1361239639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361239639 is an equidigital number, since it uses as much as digits as its factorization.

1361239639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 43.

The square root of 1361239639 is about 36894.9812169623. The cubic root of 1361239639 is about 1108.2681754196.

The spelling of 1361239639 in words is "one billion, three hundred sixty-one million, two hundred thirty-nine thousand, six hundred thirty-nine".