381161816 has 32 divisors (see below), whose sum is σ = 818976000. Its totient is φ = 162914976.

The previous prime is 381161801. The next prime is 381161821. The reversal of 381161816 is 618161183.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12245 + ... + 30203.

It is an arithmetic number, because the mean of its divisors is an integer number (25593000).

Almost surely, 2^381161816 is an apocalyptic number.

It is an amenable number.

381161816 is an abundant number, since it is smaller than the sum of its proper divisors (437814184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381161816 is a wasteful number, since it uses less digits than its factorization.

381161816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18351 (or 18347 counting only the distinct ones).

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

The square root of 381161816 is about 19523.3658983281. The cubic root of 381161816 is about 725.0530700747.

The spelling of 381161816 in words is "three hundred eighty-one million, one hundred sixty-one thousand, eight hundred sixteen".