471690991 has 2 divisors, whose sum is σ = 471690992. Its totient is φ = 471690990.

The previous prime is 471690977. The next prime is 471691039. The reversal of 471690991 is 199096174.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 471690991 - 2²³ = 463302383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (471691991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 235845495 + 235845496.

It is an arithmetic number, because the mean of its divisors is an integer number (235845496).

Almost surely, 2^471690991 is an apocalyptic number.

471690991 is a deficient number, since it is larger than the sum of its proper divisors (1).

471690991 is an equidigital number, since it uses as much as digits as its factorization.

471690991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 471690991 is about 21718.4481720035. The cubic root of 471690991 is about 778.4293349338.

The spelling of 471690991 in words is "four hundred seventy-one million, six hundred ninety thousand, nine hundred ninety-one".