381161536 has 28 divisors (see below), whose sum is σ = 864420928. Its totient is φ = 163354752.

The previous prime is 381161533. The next prime is 381161549. The reversal of 381161536 is 635161183.

It is a tau number, because it is divible by the number of its divisors (28).

It is not an unprimeable number, because it can be changed into a prime (381161533) 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, 424956 + ... + 425851.

It is an arithmetic number, because the mean of its divisors is an integer number (30872176).

Almost surely, 2^381161536 is an apocalyptic number.

It is an amenable number.

381161536 is an abundant number, since it is smaller than the sum of its proper divisors (483259392).

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

381161536 is an equidigital number, since it uses as much as digits as its factorization.

381161536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850826 (or 850816 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 381161536 is about 19523.3587274321. The cubic root of 381161536 is about 725.0528925343.

The spelling of 381161536 in words is "three hundred eighty-one million, one hundred sixty-one thousand, five hundred thirty-six".