381000731 has 2 divisors, whose sum is σ = 381000732. Its totient is φ = 381000730.

The previous prime is 381000713. The next prime is 381000733. The reversal of 381000731 is 137000183.

It is a happy number.

Together with previous prime (381000713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381000731 - 2⁶ = 381000667 is a prime.

It is a super-2 number, since 2×381000731² = 290323114045068722, which contains 22 as substring.

Together with 381000733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 381000697 and 381000706.

It is not a weakly prime, because it can be changed into another prime (381000733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190500365 + 190500366.

It is an arithmetic number, because the mean of its divisors is an integer number (190500366).

Almost surely, 2^381000731 is an apocalyptic number.

381000731 is a deficient number, since it is larger than the sum of its proper divisors (1).

381000731 is an equidigital number, since it uses as much as digits as its factorization.

381000731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 381000731 is about 19519.2400210664. The cubic root of 381000731 is about 724.9509160587.

The spelling of 381000731 in words is "three hundred eighty-one million, seven hundred thirty-one", and thus it is an aban number.