497355721 has 4 divisors (see below), whose sum is σ = 498831892. Its totient is φ = 495879552.

The previous prime is 497355697. The next prime is 497355737. The reversal of 497355721 is 127553794.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127553794 = 2 ⋅63776897.

It can be written as a sum of positive squares in 2 ways, for example, as 347636025 + 149719696 = 18645^2 + 12236^2 .

It is a cyclic number.

It is not a de Polignac number, because 497355721 - 2¹¹ = 497353673 is a prime.

It is a super-3 number, since 3×497355721³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (497355751) 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, 737580 + ... + 738253.

It is an arithmetic number, because the mean of its divisors is an integer number (124707973).

Almost surely, 2^497355721 is an apocalyptic number.

It is an amenable number.

497355721 is a deficient number, since it is larger than the sum of its proper divisors (1476171).

497355721 is a wasteful number, since it uses less digits than its factorization.

497355721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476170.

The product of its digits is 264600, while the sum is 43.

The square root of 497355721 is about 22301.4735163397. The cubic root of 497355721 is about 792.2988750797.

The spelling of 497355721 in words is "four hundred ninety-seven million, three hundred fifty-five thousand, seven hundred twenty-one".