394531648477 has 2 divisors, whose sum is σ = 394531648478. Its totient is φ = 394531648476.

The previous prime is 394531648387. The next prime is 394531648481. The reversal of 394531648477 is 774846135493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 334244703321 + 60286945156 = 578139^2 + 245534^2 .

It is a cyclic number.

It is not a de Polignac number, because 394531648477 - 2¹¹ = 394531646429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394531648177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197265824238 + 197265824239.

It is an arithmetic number, because the mean of its divisors is an integer number (197265824239).

Almost surely, 2^394531648477 is an apocalyptic number.

It is an amenable number.

394531648477 is a deficient number, since it is larger than the sum of its proper divisors (1).

394531648477 is an equidigital number, since it uses as much as digits as its factorization.

394531648477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 61.

The spelling of 394531648477 in words is "three hundred ninety-four billion, five hundred thirty-one million, six hundred forty-eight thousand, four hundred seventy-seven".