1897827632881 has 2 divisors, whose sum is σ = 1897827632882. Its totient is φ = 1897827632880.

The previous prime is 1897827632863. The next prime is 1897827632893. The reversal of 1897827632881 is 1882367287981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1097446903281 + 800380729600 = 1047591^2 + 894640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1897827632881 - 2¹⁵ = 1897827600113 is a prime.

It is a super-2 number, since 2×1897827632881² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1897827632881.

It is not a weakly prime, because it can be changed into another prime (1897827633881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948913816440 + 948913816441.

It is an arithmetic number, because the mean of its divisors is an integer number (948913816441).

Almost surely, 2^{1897827632881} is an apocalyptic number.

It is an amenable number.

1897827632881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897827632881 is an equidigital number, since it uses as much as digits as its factorization.

1897827632881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 130056192, while the sum is 70.

The spelling of 1897827632881 in words is "one trillion, eight hundred ninety-seven billion, eight hundred twenty-seven million, six hundred thirty-two thousand, eight hundred eighty-one".