381287091 has 8 divisors (see below), whose sum is σ = 508490640. Its totient is φ = 254137472.

The previous prime is 381287089. The next prime is 381287113. The reversal of 381287091 is 190782183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 381287091 - 2¹ = 381287089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381287791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7831 + ... + 28703.

It is an arithmetic number, because the mean of its divisors is an integer number (63561330).

Almost surely, 2^381287091 is an apocalyptic number.

381287091 is a deficient number, since it is larger than the sum of its proper divisors (127203549).

381287091 is a wasteful number, since it uses less digits than its factorization.

381287091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26965.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 381287091 is about 19526.5739698494. The cubic root of 381287091 is about 725.1324948495.

The spelling of 381287091 in words is "three hundred eighty-one million, two hundred eighty-seven thousand, ninety-one".