381401731 has 2 divisors, whose sum is σ = 381401732. Its totient is φ = 381401730.

The previous prime is 381401729. The next prime is 381401743. The reversal of 381401731 is 137104183.

It is a weak prime.

It is an emirp because it is prime and its reverse (137104183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381401731 - 2¹ = 381401729 is a prime.

It is a super-2 number, since 2×381401731² = 290934560819592722, which contains 22 as substring.

Together with 381401729, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381401731.

It is not a weakly prime, because it can be changed into another prime (381401771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190700865 + 190700866.

It is an arithmetic number, because the mean of its divisors is an integer number (190700866).

Almost surely, 2^381401731 is an apocalyptic number.

381401731 is a deficient number, since it is larger than the sum of its proper divisors (1).

381401731 is an equidigital number, since it uses as much as digits as its factorization.

381401731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 381401731 is about 19529.5092360254. The cubic root of 381401731 is about 725.2051617552.

The spelling of 381401731 in words is "three hundred eighty-one million, four hundred one thousand, seven hundred thirty-one".