475990993 has 2 divisors, whose sum is σ = 475990994. Its totient is φ = 475990992.

The previous prime is 475990987. The next prime is 475991053. The reversal of 475990993 is 399099574.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384826689 + 91164304 = 19617^2 + 9548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-475990993 is a prime.

It is not a weakly prime, because it can be changed into another prime (475990093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237995496 + 237995497.

It is an arithmetic number, because the mean of its divisors is an integer number (237995497).

Almost surely, 2^475990993 is an apocalyptic number.

It is an amenable number.

475990993 is a deficient number, since it is larger than the sum of its proper divisors (1).

475990993 is an equidigital number, since it uses as much as digits as its factorization.

475990993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2755620, while the sum is 55.

The square root of 475990993 is about 21817.2178107109. The cubic root of 475990993 is about 780.7876073582.

The spelling of 475990993 in words is "four hundred seventy-five million, nine hundred ninety thousand, nine hundred ninety-three".