1379505539 has 2 divisors, whose sum is σ = 1379505540. Its totient is φ = 1379505538.

The previous prime is 1379505509. The next prime is 1379505541. The reversal of 1379505539 is 9355059731.

It is a strong prime.

It is an emirp because it is prime and its reverse (9355059731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1379505539 - 2¹² = 1379501443 is a prime.

Together with 1379505541, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1379505493 and 1379505502.

It is not a weakly prime, because it can be changed into another prime (1379505509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689752769 + 689752770.

It is an arithmetic number, because the mean of its divisors is an integer number (689752770).

Almost surely, 2^1379505539 is an apocalyptic number.

1379505539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1379505539 is an equidigital number, since it uses as much as digits as its factorization.

1379505539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 637875, while the sum is 47.

The square root of 1379505539 is about 37141.6954244149. The cubic root of 1379505539 is about 1113.2032942907.

The spelling of 1379505539 in words is "one billion, three hundred seventy-nine million, five hundred five thousand, five hundred thirty-nine".