381033311 has 4 divisors (see below), whose sum is σ = 382551624. Its totient is φ = 379515000.

The previous prime is 381033241. The next prime is 381033383. The reversal of 381033311 is 113330183.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381033311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381030311) 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, 758780 + ... + 759281.

It is an arithmetic number, because the mean of its divisors is an integer number (95637906).

Almost surely, 2^381033311 is an apocalyptic number.

381033311 is a deficient number, since it is larger than the sum of its proper divisors (1518313).

381033311 is a wasteful number, since it uses less digits than its factorization.

381033311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518312.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 381033311 is about 19520.0745644068. The cubic root of 381033311 is about 724.9715793853.

Adding to 381033311 its reverse (113330183), we get a palindrome (494363494).

It can be divided in two parts, 38103 and 3311, that added together give a palindrome (41414).

The spelling of 381033311 in words is "three hundred eighty-one million, thirty-three thousand, three hundred eleven".