1990831804417 has 4 divisors (see below), whose sum is σ = 2107939557636. Its totient is φ = 1873724051200.

The previous prime is 1990831804411. The next prime is 1990831804427. The reversal of 1990831804417 is 7144081380991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1293112396801 + 697719407616 = 1137151^2 + 835296^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990831804417 - 2¹¹ = 1990831802369 is a prime.

It is a super-2 number, since 2×1990831804417² (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 (1990831804411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58553876584 + ... + 58553876617.

It is an arithmetic number, because the mean of its divisors is an integer number (526984889409).

Almost surely, 2^{1990831804417} is an apocalyptic number.

1990831804417 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1990831804417 is a deficient number, since it is larger than the sum of its proper divisors (117107753219).

1990831804417 is a wasteful number, since it uses less digits than its factorization.

1990831804417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117107753218.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 1990831804417 in words is "one trillion, nine hundred ninety billion, eight hundred thirty-one million, eight hundred four thousand, four hundred seventeen".