381707731 has 2 divisors, whose sum is σ = 381707732. Its totient is φ = 381707730.

The previous prime is 381707713. The next prime is 381707737. The reversal of 381707731 is 137707183.

Together with previous prime (381707713) 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 381707731 - 2⁵ = 381707699 is a prime.

It is a super-2 number, since 2×381707731² = 291401583810336722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (381707737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190853865 + 190853866.

It is an arithmetic number, because the mean of its divisors is an integer number (190853866).

Almost surely, 2^381707731 is an apocalyptic number.

381707731 is the 12357-th centered pentagonal number.

381707731 is a deficient number, since it is larger than the sum of its proper divisors (1).

381707731 is an equidigital number, since it uses as much as digits as its factorization.

381707731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 381707731 is about 19537.3419635323. The cubic root of 381707731 is about 725.3990548262.

The spelling of 381707731 in words is "three hundred eighty-one million, seven hundred seven thousand, seven hundred thirty-one".