381755321 has 4 divisors (see below), whose sum is σ = 382024272. Its totient is φ = 381486372.

The previous prime is 381755303. The next prime is 381755323. The reversal of 381755321 is 123557183.

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 not a de Polignac number, because 381755321 - 2²⁶ = 314646457 is a prime.

It is a super-2 number, since 2×381755321² = 291474250223626082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381755323) 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, 132335 + ... + 135188.

It is an arithmetic number, because the mean of its divisors is an integer number (95506068).

Almost surely, 2^381755321 is an apocalyptic number.

It is an amenable number.

381755321 is a deficient number, since it is larger than the sum of its proper divisors (268951).

381755321 is a wasteful number, since it uses less digits than its factorization.

381755321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268950.

The product of its digits is 25200, while the sum is 35.

The square root of 381755321 is about 19538.5598496921. The cubic root of 381755321 is about 725.4292003221.

The spelling of 381755321 in words is "three hundred eighty-one million, seven hundred fifty-five thousand, three hundred twenty-one".