381120031 has 4 divisors (see below), whose sum is σ = 401179000. Its totient is φ = 361061064.

The previous prime is 381120029. The next prime is 381120067. The reversal of 381120031 is 130021183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130021183 = 257 ⋅505919.

It is a cyclic number.

It is not a de Polignac number, because 381120031 - 2¹ = 381120029 is a prime.

It is a super-2 number, since 2×381120031² = 290504956058881922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 20058949 = 381120031 / (3 + 8 + 1 + 1 + 2 + 0 + 0 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381119990 and 381120008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381120071) 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, 10029456 + ... + 10029493.

It is an arithmetic number, because the mean of its divisors is an integer number (100294750).

Almost surely, 2^381120031 is an apocalyptic number.

381120031 is a deficient number, since it is larger than the sum of its proper divisors (20058969).

381120031 is a wasteful number, since it uses less digits than its factorization.

381120031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20058968.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 381120031 is about 19522.2957410239. The cubic root of 381120031 is about 725.0265743727.

The spelling of 381120031 in words is "three hundred eighty-one million, one hundred twenty thousand, thirty-one".