1385810891 has 2 divisors, whose sum is σ = 1385810892. Its totient is φ = 1385810890.

The previous prime is 1385810863. The next prime is 1385810893. The reversal of 1385810891 is 1980185831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1385810891 - 2⁶ = 1385810827 is a prime.

It is a super-2 number, since 2×1385810891² = 3840943651228427762, which contains 22 as substring.

Together with 1385810893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1385810893) 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, 692905445 + 692905446.

It is an arithmetic number, because the mean of its divisors is an integer number (692905446).

Almost surely, 2^1385810891 is an apocalyptic number.

1385810891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385810891 is an equidigital number, since it uses as much as digits as its factorization.

1385810891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 44.

The square root of 1385810891 is about 37226.4810450840. The cubic root of 1385810891 is about 1114.8967685802.

The spelling of 1385810891 in words is "one billion, three hundred eighty-five million, eight hundred ten thousand, eight hundred ninety-one".