475639421 has 2 divisors, whose sum is σ = 475639422. Its totient is φ = 475639420.

The previous prime is 475639399. The next prime is 475639433. The reversal of 475639421 is 124936574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394459321 + 81180100 = 19861^2 + 9010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-475639421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (475639321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237819710 + 237819711.

It is an arithmetic number, because the mean of its divisors is an integer number (237819711).

Almost surely, 2^475639421 is an apocalyptic number.

It is an amenable number.

475639421 is a deficient number, since it is larger than the sum of its proper divisors (1).

475639421 is an equidigital number, since it uses as much as digits as its factorization.

475639421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The square root of 475639421 is about 21809.1591080445. The cubic root of 475639421 is about 780.5953273388.

The spelling of 475639421 in words is "four hundred seventy-five million, six hundred thirty-nine thousand, four hundred twenty-one".