381819811061 has 16 divisors (see below), whose sum is σ = 422389705584. Its totient is φ = 342853668864.

The previous prime is 381819811057. The next prime is 381819811081. The reversal of 381819811061 is 160118918183.

It can be written as a sum of positive squares in 8 ways, for example, as 243048100 + 381576762961 = 15590^2 + 617719^2 .

It is a cyclic number.

It is not a de Polignac number, because 381819811061 - 2² = 381819811057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381819810997 and 381819811015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381819811001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2363861 + ... + 2520213.

It is an arithmetic number, because the mean of its divisors is an integer number (26399356599).

Almost surely, 2^381819811061 is an apocalyptic number.

It is an amenable number.

381819811061 is a deficient number, since it is larger than the sum of its proper divisors (40569894523).

381819811061 is a wasteful number, since it uses less digits than its factorization.

381819811061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161480.

The product of its (nonzero) digits is 82944, while the sum is 47.

The spelling of 381819811061 in words is "three hundred eighty-one billion, eight hundred nineteen million, eight hundred eleven thousand, sixty-one".