475457991 has 16 divisors (see below), whose sum is σ = 641362176. Its totient is φ = 313275456.

The previous prime is 475457981. The next prime is 475457993. The reversal of 475457991 is 199754574.

It is not a de Polignac number, because 475457991 - 2⁵ = 475457959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (475457993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197491 + ... + 199883.

It is an arithmetic number, because the mean of its divisors is an integer number (40085136).

Almost surely, 2^475457991 is an apocalyptic number.

475457991 is a deficient number, since it is larger than the sum of its proper divisors (165904185).

475457991 is a wasteful number, since it uses less digits than its factorization.

475457991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142.

The product of its digits is 1587600, while the sum is 51.

The square root of 475457991 is about 21804.9992203623. Note that the first 3 decimals coincide. The cubic root of 475457991 is about 780.4960634742.

The spelling of 475457991 in words is "four hundred seventy-five million, four hundred fifty-seven thousand, nine hundred ninety-one".