381389303531 has 2 divisors, whose sum is σ = 381389303532. Its totient is φ = 381389303530.

The previous prime is 381389303507. The next prime is 381389303539. The reversal of 381389303531 is 135303983183.

It is a strong prime.

It is an emirp because it is prime and its reverse (135303983183) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381389303531 is a prime.

It is a super-2 number, since 2×381389303531² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (381389303539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190694651765 + 190694651766.

It is an arithmetic number, because the mean of its divisors is an integer number (190694651766).

Almost surely, 2^381389303531 is an apocalyptic number.

381389303531 is a deficient number, since it is larger than the sum of its proper divisors (1).

381389303531 is an equidigital number, since it uses as much as digits as its factorization.

381389303531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 47.

The spelling of 381389303531 in words is "three hundred eighty-one billion, three hundred eighty-nine million, three hundred three thousand, five hundred thirty-one".