1385938091 has 2 divisors, whose sum is σ = 1385938092. Its totient is φ = 1385938090.

The previous prime is 1385938079. The next prime is 1385938093. The reversal of 1385938091 is 1908395831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1385938091 - 2²² = 1381743787 is a prime.

It is a super-3 number, since 3×1385938091³ (a number of 28 digits) contains 333 as substring.

Together with 1385938093, 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 (1385938093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692969045 + 692969046.

It is an arithmetic number, because the mean of its divisors is an integer number (692969046).

Almost surely, 2^1385938091 is an apocalyptic number.

1385938091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385938091 is an equidigital number, since it uses as much as digits as its factorization.

1385938091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 1385938091 is about 37228.1894671229. The cubic root of 1385938091 is about 1114.9308787009.

The spelling of 1385938091 in words is "one billion, three hundred eighty-five million, nine hundred thirty-eight thousand, ninety-one".