381489202681 has 4 divisors (see below), whose sum is σ = 383919070372. Its totient is φ = 379059334992.

The previous prime is 381489202637. The next prime is 381489202799. The reversal of 381489202681 is 186202984183.

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

It can be written as a sum of positive squares in 2 ways, for example, as 244965603600 + 136523599081 = 494940^2 + 369491^2 .

It is a cyclic number.

It is not a de Polignac number, because 381489202681 - 2⁹ = 381489202169 is a prime.

It is a super-2 number, since 2×381489202681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381489202981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1214933610 + ... + 1214933923.

It is an arithmetic number, because the mean of its divisors is an integer number (95979767593).

Almost surely, 2^381489202681 is an apocalyptic number.

It is an amenable number.

381489202681 is a deficient number, since it is larger than the sum of its proper divisors (2429867691).

381489202681 is a wasteful number, since it uses less digits than its factorization.

381489202681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429867690.

The product of its (nonzero) digits is 1327104, while the sum is 52.

The spelling of 381489202681 in words is "three hundred eighty-one billion, four hundred eighty-nine million, two hundred two thousand, six hundred eighty-one".