1386716491 has 2 divisors, whose sum is σ = 1386716492. Its totient is φ = 1386716490.

The previous prime is 1386716489. The next prime is 1386716543. The reversal of 1386716491 is 1946176831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1386716491 - 2¹ = 1386716489 is a prime.

It is a super-2 number, since 2×1386716491² = 3845965252822706162, which contains 22 as substring.

Together with 1386716489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1386716411) 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, 693358245 + 693358246.

It is an arithmetic number, because the mean of its divisors is an integer number (693358246).

Almost surely, 2^1386716491 is an apocalyptic number.

1386716491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1386716491 is an equidigital number, since it uses as much as digits as its factorization.

1386716491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 1386716491 is about 37238.6424430322. The cubic root of 1386716491 is about 1115.1395700262.

The spelling of 1386716491 in words is "one billion, three hundred eighty-six million, seven hundred sixteen thousand, four hundred ninety-one".