1031866545881 has 4 divisors (see below), whose sum is σ = 1036412213712. Its totient is φ = 1027320878052.

The previous prime is 1031866545877. The next prime is 1031866545893. The reversal of 1031866545881 is 1885456681301.

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 1031866545881 - 2² = 1031866545877 is a prime.

It is a super-2 number, since 2×1031866545881² (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 (1031866545181) 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, 2272833575 + ... + 2272834028.

It is an arithmetic number, because the mean of its divisors is an integer number (259103053428).

Almost surely, 2^{1031866545881} is an apocalyptic number.

It is an amenable number.

1031866545881 is a deficient number, since it is larger than the sum of its proper divisors (4545667831).

1031866545881 is an equidigital number, since it uses as much as digits as its factorization.

1031866545881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545667830.

The product of its (nonzero) digits is 5529600, while the sum is 56.

The spelling of 1031866545881 in words is "one trillion, thirty-one billion, eight hundred sixty-six million, five hundred forty-five thousand, eight hundred eighty-one".