381133508986 has 4 divisors (see below), whose sum is σ = 571700263482. Its totient is φ = 190566754492.

The previous prime is 381133508983. The next prime is 381133508993. The reversal of 381133508986 is 689805331183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689805331183 = 1559 ⋅442466537.

It can be written as a sum of positive squares in only one way, i.e., 207315391761 + 173818117225 = 455319^2 + 416915^2 .

It is not an unprimeable number, because it can be changed into a prime (381133508981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95283377245 + ... + 95283377248.

Almost surely, 2^381133508986 is an apocalyptic number.

381133508986 is a deficient number, since it is larger than the sum of its proper divisors (190566754496).

381133508986 is a wasteful number, since it uses less digits than its factorization.

381133508986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190566754495.

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 381133508986 in words is "three hundred eighty-one billion, one hundred thirty-three million, five hundred eight thousand, nine hundred eighty-six".