475551509 has 2 divisors, whose sum is σ = 475551510. Its totient is φ = 475551508.

The previous prime is 475551463. The next prime is 475551511. The reversal of 475551509 is 905155574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389470225 + 86081284 = 19735^2 + 9278^2 .

It is a cyclic number.

It is not a de Polignac number, because 475551509 - 2²⁴ = 458774293 is a prime.

It is a super-2 number, since 2×475551509² = 452298475424354162, which contains 22 as substring.

Together with 475551511, 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 (475551409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237775754 + 237775755.

It is an arithmetic number, because the mean of its divisors is an integer number (237775755).

Almost surely, 2^475551509 is an apocalyptic number.

It is an amenable number.

475551509 is a deficient number, since it is larger than the sum of its proper divisors (1).

475551509 is an equidigital number, since it uses as much as digits as its factorization.

475551509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157500, while the sum is 41.

The square root of 475551509 is about 21807.1435314211. The cubic root of 475551509 is about 780.5472321349.

The spelling of 475551509 in words is "four hundred seventy-five million, five hundred fifty-one thousand, five hundred nine".