487771172621 has 4 divisors (see below), whose sum is σ = 487779486012. Its totient is φ = 487762859232.

The previous prime is 487771172611. The next prime is 487771172633. The reversal of 487771172621 is 126271177784.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200893100521 + 286878072100 = 448211^2 + 535610^2 .

It is a cyclic number.

It is not a de Polignac number, because 487771172621 - 2⁶ = 487771172557 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 (487771172611) 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, 4068056 + ... + 4186241.

It is an arithmetic number, because the mean of its divisors is an integer number (121944871503).

Almost surely, 2^487771172621 is an apocalyptic number.

It is an amenable number.

487771172621 is a deficient number, since it is larger than the sum of its proper divisors (8313391).

487771172621 is an equidigital number, since it uses as much as digits as its factorization.

487771172621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8313390.

The product of its digits is 1843968, while the sum is 53.

The spelling of 487771172621 in words is "four hundred eighty-seven billion, seven hundred seventy-one million, one hundred seventy-two thousand, six hundred twenty-one".