381198861 has 6 divisors (see below), whose sum is σ = 550620590. Its totient is φ = 254132568.

The previous prime is 381198859. The next prime is 381198869. The reversal of 381198861 is 168891183.

381198861 is a `hidden beast` number, since 381 + 198 + 86 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 345736836 + 35462025 = 18594^2 + 5955^2 .

It is not a de Polignac number, because 381198861 - 2¹ = 381198859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381198869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21177706 + ... + 21177723.

Almost surely, 2^381198861 is an apocalyptic number.

It is an amenable number.

381198861 is a deficient number, since it is larger than the sum of its proper divisors (169421729).

381198861 is a wasteful number, since it uses less digits than its factorization.

381198861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42355435 (or 42355432 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 381198861 is about 19524.3146102494. The cubic root of 381198861 is about 725.0765585423.

The spelling of 381198861 in words is "three hundred eighty-one million, one hundred ninety-eight thousand, eight hundred sixty-one".