475181989 has 2 divisors, whose sum is σ = 475181990. Its totient is φ = 475181988.

The previous prime is 475181983. The next prime is 475182007. The reversal of 475181989 is 989181574.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296425089 + 178756900 = 17217^2 + 13370^2 .

It is a cyclic number.

It is not a de Polignac number, because 475181989 - 2⁵ = 475181957 is a prime.

It is a super-2 number, since 2×475181989² = 451595845339992242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (475181983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237590994 + 237590995.

It is an arithmetic number, because the mean of its divisors is an integer number (237590995).

Almost surely, 2^475181989 is an apocalyptic number.

It is an amenable number.

475181989 is a deficient number, since it is larger than the sum of its proper divisors (1).

475181989 is an equidigital number, since it uses as much as digits as its factorization.

475181989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 52.

The square root of 475181989 is about 21798.6694318713. The cubic root of 475181989 is about 780.3450089995.

The spelling of 475181989 in words is "four hundred seventy-five million, one hundred eighty-one thousand, nine hundred eighty-nine".