381225139 has 4 divisors (see below), whose sum is σ = 401289640. Its totient is φ = 361160640.

The previous prime is 381225133. The next prime is 381225149. The reversal of 381225139 is 931522183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931522183 = 197 ⋅4728539.

It is a cyclic number.

It is not a de Polignac number, because 381225139 - 2⁵ = 381225107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381225133) 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, 10032222 + ... + 10032259.

It is an arithmetic number, because the mean of its divisors is an integer number (100322410).

Almost surely, 2^381225139 is an apocalyptic number.

381225139 is a deficient number, since it is larger than the sum of its proper divisors (20064501).

381225139 is a wasteful number, since it uses less digits than its factorization.

381225139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20064500.

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

The square root of 381225139 is about 19524.9875544134. The cubic root of 381225139 is about 725.0932192462.

The spelling of 381225139 in words is "three hundred eighty-one million, two hundred twenty-five thousand, one hundred thirty-nine".