417991989529 has 3 divisors (see below), whose sum is σ = 417992636053. Its totient is φ = 417991343006.

The previous prime is 417991989511. The next prime is 417991989673. The reversal of 417991989529 is 925989199714.

It is a happy number.

The square root of 417991989529 is 646523.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 925989199714 = 2 ⋅462994599857.

It is not a de Polignac number, because 417991989529 - 2²¹ = 417989892377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (417991980529) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 323262 + ... + 969784.

Almost surely, 2^417991989529 is an apocalyptic number.

417991989529 is the 646523-rd square number.

417991989529 is the 323262-nd centered octagonal number.

It is an amenable number.

417991989529 is a deficient number, since it is larger than the sum of its proper divisors (646524).

417991989529 is an frugal number, since it uses more digits than its factorization.

417991989529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293046 (or 646523 counting only the distinct ones).

The product of its digits is 132269760, while the sum is 73.

The spelling of 417991989529 in words is "four hundred seventeen billion, nine hundred ninety-one million, nine hundred eighty-nine thousand, five hundred twenty-nine".