504751990681 has 3 divisors (see below), whose sum is σ = 504752701141. Its totient is φ = 504751280222.

The previous prime is 504751990669. The next prime is 504751990811. The reversal of 504751990681 is 186099157405.

It is a happy number.

The square root of 504751990681 is 710459.

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.

It is not a de Polignac number, because 504751990681 - 2¹⁷ = 504751859609 is a prime.

It is a super-2 number, since 2×504751990681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (504751990651) 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, 355230 + ... + 1065688.

Almost surely, 2^504751990681 is an apocalyptic number.

504751990681 is the 710459-th square number.

504751990681 is the 355230-th centered octagonal number.

It is an amenable number.

504751990681 is a deficient number, since it is larger than the sum of its proper divisors (710460).

504751990681 is an frugal number, since it uses more digits than its factorization.

504751990681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420918 (or 710459 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 55.

The spelling of 504751990681 in words is "five hundred four billion, seven hundred fifty-one million, nine hundred ninety thousand, six hundred eighty-one".