381588315821 has 8 divisors (see below), whose sum is σ = 389015616288. Its totient is φ = 374198814000.

The previous prime is 381588315803. The next prime is 381588315847. The reversal of 381588315821 is 128513885183.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381588315821 is a prime.

It is a super-2 number, since 2×381588315821² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381588345821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9429275 + ... + 9469656.

It is an arithmetic number, because the mean of its divisors is an integer number (48626952036).

Almost surely, 2^381588315821 is an apocalyptic number.

It is an amenable number.

381588315821 is a deficient number, since it is larger than the sum of its proper divisors (7427300467).

381588315821 is a wasteful number, since it uses less digits than its factorization.

381588315821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18899323.

The product of its digits is 1843200, while the sum is 53.

The spelling of 381588315821 in words is "three hundred eighty-one billion, five hundred eighty-eight million, three hundred fifteen thousand, eight hundred twenty-one".