381018891 has 8 divisors (see below), whose sum is σ = 554209344. Its totient is φ = 230920520.

The previous prime is 381018889. The next prime is 381018919. The reversal of 381018891 is 198810183.

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 381018891 - 2¹ = 381018889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381018811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5772981 + ... + 5773046.

It is an arithmetic number, because the mean of its divisors is an integer number (69276168).

Almost surely, 2^381018891 is an apocalyptic number.

381018891 is a deficient number, since it is larger than the sum of its proper divisors (173190453).

381018891 is a wasteful number, since it uses less digits than its factorization.

381018891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11546041.

The product of its (nonzero) digits is 13824, while the sum is 39.

The square root of 381018891 is about 19519.7051975689. The cubic root of 381018891 is about 724.9624338839.

The spelling of 381018891 in words is "three hundred eighty-one million, eighteen thousand, eight hundred ninety-one".