490877496821 has 4 divisors (see below), whose sum is σ = 491011218144. Its totient is φ = 490743775500.

The previous prime is 490877496797. The next prime is 490877496827. The reversal of 490877496821 is 128694778094.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-490877496821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (490877496827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66855155 + ... + 66862496.

It is an arithmetic number, because the mean of its divisors is an integer number (122752804536).

Almost surely, 2^490877496821 is an apocalyptic number.

It is an amenable number.

490877496821 is a deficient number, since it is larger than the sum of its proper divisors (133721323).

490877496821 is a wasteful number, since it uses less digits than its factorization.

490877496821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133721322.

The product of its (nonzero) digits is 48771072, while the sum is 65.

The spelling of 490877496821 in words is "four hundred ninety billion, eight hundred seventy-seven million, four hundred ninety-six thousand, eight hundred twenty-one".