472805621 has 2 divisors, whose sum is σ = 472805622. Its totient is φ = 472805620.

The previous prime is 472805569. The next prime is 472805623. The reversal of 472805621 is 126508274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 467164996 + 5640625 = 21614^2 + 2375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-472805621 is a prime.

Together with 472805623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (472805623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 236402810 + 236402811.

It is an arithmetic number, because the mean of its divisors is an integer number (236402811).

Almost surely, 2^472805621 is an apocalyptic number.

It is an amenable number.

472805621 is a deficient number, since it is larger than the sum of its proper divisors (1).

472805621 is an equidigital number, since it uses as much as digits as its factorization.

472805621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 472805621 is about 21744.0939337559. The cubic root of 472805621 is about 779.0420087391.

The spelling of 472805621 in words is "four hundred seventy-two million, eight hundred five thousand, six hundred twenty-one".