381840031 has 2 divisors, whose sum is σ = 381840032. Its totient is φ = 381840030.

The previous prime is 381839999. The next prime is 381840047. The reversal of 381840031 is 130048183.

It is a strong prime.

It is an emirp because it is prime and its reverse (130048183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381840031 - 2⁵ = 381839999 is a prime.

It is a super-2 number, since 2×381840031² = 291603618548161922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381840061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190920015 + 190920016.

It is an arithmetic number, because the mean of its divisors is an integer number (190920016).

Almost surely, 2^381840031 is an apocalyptic number.

381840031 is a deficient number, since it is larger than the sum of its proper divisors (1).

381840031 is an equidigital number, since it uses as much as digits as its factorization.

381840031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 381840031 is about 19540.7274941339. The cubic root of 381840031 is about 725.4828529799.

The spelling of 381840031 in words is "three hundred eighty-one million, eight hundred forty thousand, thirty-one".