381391508401 has 4 divisors (see below), whose sum is σ = 381392874304. Its totient is φ = 381390142500.

The previous prime is 381391508369. The next prime is 381391508413. The reversal of 381391508401 is 104805193183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 104805193183 = 7459 ⋅14050837.

It is a cyclic number.

It is not a de Polignac number, because 381391508401 - 2⁵ = 381391508369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381391508461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95925 + ... + 878626.

It is an arithmetic number, because the mean of its divisors is an integer number (95348218576).

Almost surely, 2^381391508401 is an apocalyptic number.

It is an amenable number.

381391508401 is a deficient number, since it is larger than the sum of its proper divisors (1365903).

381391508401 is an equidigital number, since it uses as much as digits as its factorization.

381391508401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365902.

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 381391508401 in words is "three hundred eighty-one billion, three hundred ninety-one million, five hundred eight thousand, four hundred one".