381346591 has 4 divisors (see below), whose sum is σ = 382929184. Its totient is φ = 379764000.

The previous prime is 381346573. The next prime is 381346597. The reversal of 381346591 is 195643183.

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 381346591 - 2⁹ = 381346079 is a prime.

It is a super-3 number, since 3×381346591³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381346597) 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, 790935 + ... + 791416.

It is an arithmetic number, because the mean of its divisors is an integer number (95732296).

Almost surely, 2^381346591 is an apocalyptic number.

381346591 is a deficient number, since it is larger than the sum of its proper divisors (1582593).

381346591 is a wasteful number, since it uses less digits than its factorization.

381346591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582592.

The product of its digits is 77760, while the sum is 40.

The square root of 381346591 is about 19528.0974751766. The cubic root of 381346591 is about 725.1702119577.

The spelling of 381346591 in words is "three hundred eighty-one million, three hundred forty-six thousand, five hundred ninety-one".