1898318138981 has 48 divisors (see below), whose sum is σ = 2244127939200. Its totient is φ = 1599562673280.

The previous prime is 1898318138971. The next prime is 1898318139041.

1898318138981 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-1898318138981 is a prime.

It is a super-2 number, since 2×1898318138981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1898318138971) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43721375 + ... + 43764771.

It is an arithmetic number, because the mean of its divisors is an integer number (46752665400).

Almost surely, 2^{1898318138981} is an apocalyptic number.

1898318138981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1898318138981 is a deficient number, since it is larger than the sum of its proper divisors (345809800219).

1898318138981 is a wasteful number, since it uses less digits than its factorization.

1898318138981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43850 (or 43839 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 68.

The spelling of 1898318138981 in words is "one trillion, eight hundred ninety-eight billion, three hundred eighteen million, one hundred thirty-eight thousand, nine hundred eighty-one".