381312497986 has 12 divisors (see below), whose sum is σ = 665351399718. Its totient is φ = 163419641952.

The previous prime is 381312497939. The next prime is 381312497987. The reversal of 381312497986 is 689794213183.

It can be written as a sum of positive squares in only one way, i.e., 279571275025 + 101741222961 = 528745^2 + 318969^2 .

It is a super-2 number, since 2×381312497986² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381312497987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1945471831 + ... + 1945472026.

Almost surely, 2^381312497986 is an apocalyptic number.

381312497986 is a deficient number, since it is larger than the sum of its proper divisors (284038901732).

381312497986 is a wasteful number, since it uses less digits than its factorization.

381312497986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890943873 (or 3890943866 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 61.

The spelling of 381312497986 in words is "three hundred eighty-one billion, three hundred twelve million, four hundred ninety-seven thousand, nine hundred eighty-six".