1381131838081 has 4 divisors (see below), whose sum is σ = 1381164777472. Its totient is φ = 1381098898692.

The previous prime is 1381131838067. The next prime is 1381131838127. The reversal of 1381131838081 is 1808381311831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1381131838081 - 2¹¹ = 1381131836033 is a prime.

It is a super-2 number, since 2×1381131838081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381131838181) 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, 16406721 + ... + 16490686.

It is an arithmetic number, because the mean of its divisors is an integer number (345291194368).

Almost surely, 2^{1381131838081} is an apocalyptic number.

It is an amenable number.

1381131838081 is a deficient number, since it is larger than the sum of its proper divisors (32939391).

1381131838081 is an equidigital number, since it uses as much as digits as its factorization.

1381131838081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32939390.

The product of its (nonzero) digits is 110592, while the sum is 46.

The spelling of 1381131838081 in words is "one trillion, three hundred eighty-one billion, one hundred thirty-one million, eight hundred thirty-eight thousand, eighty-one".