381861611 has 4 divisors (see below), whose sum is σ = 383383224. Its totient is φ = 380340000.

The previous prime is 381861581. The next prime is 381861631. The reversal of 381861611 is 116168183.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381861611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381861631) 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, 760430 + ... + 760931.

It is an arithmetic number, because the mean of its divisors is an integer number (95845806).

Almost surely, 2^381861611 is an apocalyptic number.

381861611 is a deficient number, since it is larger than the sum of its proper divisors (1521613).

381861611 is a wasteful number, since it uses less digits than its factorization.

381861611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521612.

The product of its digits is 6912, while the sum is 35.

The square root of 381861611 is about 19541.2796663883. The cubic root of 381861611 is about 725.4965198070.

The spelling of 381861611 in words is "three hundred eighty-one million, eight hundred sixty-one thousand, six hundred eleven".