497821861 has 8 divisors (see below), whose sum is σ = 500220000. Its totient is φ = 495430320.

The previous prime is 497821847. The next prime is 497821871. The reversal of 497821861 is 168128794.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 497821861 - 2⁹ = 497821349 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 (497821811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207891 + ... + 210271.

It is an arithmetic number, because the mean of its divisors is an integer number (62527500).

Almost surely, 2^497821861 is an apocalyptic number.

It is an amenable number.

497821861 is a deficient number, since it is larger than the sum of its proper divisors (2398139).

497821861 is a wasteful number, since it uses less digits than its factorization.

497821861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299.

The product of its digits is 193536, while the sum is 46.

The square root of 497821861 is about 22311.9219476942. The cubic root of 497821861 is about 792.5463216331.

The spelling of 497821861 in words is "four hundred ninety-seven million, eight hundred twenty-one thousand, eight hundred sixty-one".