201680477 has 2 divisors, whose sum is σ = 201680478. Its totient is φ = 201680476.

The previous prime is 201680461. The next prime is 201680483. The reversal of 201680477 is 774086102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173949721 + 27730756 = 13189^2 + 5266^2 .

It is a cyclic number.

It is not a de Polignac number, because 201680477 - 2⁴ = 201680461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201680417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100840238 + 100840239.

It is an arithmetic number, because the mean of its divisors is an integer number (100840239).

Almost surely, 2^201680477 is an apocalyptic number.

It is an amenable number.

201680477 is a deficient number, since it is larger than the sum of its proper divisors (1).

201680477 is an equidigital number, since it uses as much as digits as its factorization.

201680477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 201680477 is about 14201.4251749604. The cubic root of 201680477 is about 586.4368963261.

Subtracting 201680477 from its reverse (774086102), we obtain a square (572405625 = 23925²).

The spelling of 201680477 in words is "two hundred one million, six hundred eighty thousand, four hundred seventy-seven".