636671473 has 2 divisors, whose sum is σ = 636671474. Its totient is φ = 636671472.

The previous prime is 636671449. The next prime is 636671489. The reversal of 636671473 is 374176636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396328464 + 240343009 = 19908^2 + 15503^2 .

It is a cyclic number.

It is not a de Polignac number, because 636671473 - 2²¹ = 634574321 is a prime.

It is not a weakly prime, because it can be changed into another prime (636671443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318335736 + 318335737.

It is an arithmetic number, because the mean of its divisors is an integer number (318335737).

Almost surely, 2^636671473 is an apocalyptic number.

It is an amenable number.

636671473 is a deficient number, since it is larger than the sum of its proper divisors (1).

636671473 is an equidigital number, since it uses as much as digits as its factorization.

636671473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 43.

The square root of 636671473 is about 25232.3497320404. The cubic root of 636671473 is about 860.2773006075.

The spelling of 636671473 in words is "six hundred thirty-six million, six hundred seventy-one thousand, four hundred seventy-three".