381991313026 has 4 divisors (see below), whose sum is σ = 572986969542. Its totient is φ = 190995656512.

The previous prime is 381991313023. The next prime is 381991313059. The reversal of 381991313026 is 620313199183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 228718280025 + 153273033001 = 478245^2 + 391501^2 .

It is not an unprimeable number, because it can be changed into a prime (381991313021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95497828255 + ... + 95497828258.

Almost surely, 2^381991313026 is an apocalyptic number.

381991313026 is a deficient number, since it is larger than the sum of its proper divisors (190995656516).

381991313026 is a wasteful number, since it uses less digits than its factorization.

381991313026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190995656515.

The product of its (nonzero) digits is 209952, while the sum is 46.

The spelling of 381991313026 in words is "three hundred eighty-one billion, nine hundred ninety-one million, three hundred thirteen thousand, twenty-six".