381061816 has 16 divisors (see below), whose sum is σ = 733802040. Its totient is φ = 185381280.

The previous prime is 381061781. The next prime is 381061819. The reversal of 381061816 is 618160183.

It is a super-2 number, since 2×381061816² = 290416215226435712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381061819) 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, 643390 + ... + 643981.

Almost surely, 2^381061816 is an apocalyptic number.

It is an amenable number.

381061816 is a deficient number, since it is larger than the sum of its proper divisors (352740224).

381061816 is a wasteful number, since it uses less digits than its factorization.

381061816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287414 (or 1287410 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 381061816 is about 19520.8046965283. The cubic root of 381061816 is about 724.9896572444.

The spelling of 381061816 in words is "three hundred eighty-one million, sixty-one thousand, eight hundred sixteen".