385135381 has 4 divisors (see below), whose sum is σ = 386299264. Its totient is φ = 383971500.

The previous prime is 385135369. The next prime is 385135397. The reversal of 385135381 is 183531583.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385135381 is a prime.

It is a super-2 number, since 2×385135381² = 296658523396030322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 385135381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385135081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581445 + ... + 582106.

It is an arithmetic number, because the mean of its divisors is an integer number (96574816).

Almost surely, 2^385135381 is an apocalyptic number.

It is an amenable number.

385135381 is a deficient number, since it is larger than the sum of its proper divisors (1163883).

385135381 is a wasteful number, since it uses less digits than its factorization.

385135381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163882.

The product of its digits is 43200, while the sum is 37.

The square root of 385135381 is about 19624.8663944497. The cubic root of 385135381 is about 727.5638948301.

The spelling of 385135381 in words is "three hundred eighty-five million, one hundred thirty-five thousand, three hundred eighty-one".