381503311 has 4 divisors (see below), whose sum is σ = 436003792. Its totient is φ = 327002832.

The previous prime is 381503279. The next prime is 381503327. The reversal of 381503311 is 113305183.

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

It is a cyclic number.

It is not a de Polignac number, because 381503311 - 2⁵ = 381503279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381503011) 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, 27250230 + ... + 27250243.

It is an arithmetic number, because the mean of its divisors is an integer number (109000948).

Almost surely, 2^381503311 is an apocalyptic number.

381503311 is a deficient number, since it is larger than the sum of its proper divisors (54500481).

381503311 is an equidigital number, since it uses as much as digits as its factorization.

381503311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54500480.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 381503311 is about 19532.1097426776. The cubic root of 381503311 is about 725.2695381466.

Adding to 381503311 its reverse (113305183), we get a palindrome (494808494).

The spelling of 381503311 in words is "three hundred eighty-one million, five hundred three thousand, three hundred eleven".