395447561 has 2 divisors, whose sum is σ = 395447562. Its totient is φ = 395447560.

The previous prime is 395447537. The next prime is 395447573. The reversal of 395447561 is 165744593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381459961 + 13987600 = 19531^2 + 3740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-395447561 is a prime.

It is not a weakly prime, because it can be changed into another prime (395447581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197723780 + 197723781.

It is an arithmetic number, because the mean of its divisors is an integer number (197723781).

Almost surely, 2^395447561 is an apocalyptic number.

It is an amenable number.

395447561 is a deficient number, since it is larger than the sum of its proper divisors (1).

395447561 is an equidigital number, since it uses as much as digits as its factorization.

395447561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 44.

The square root of 395447561 is about 19885.8633456031. The cubic root of 395447561 is about 734.0004064918. Note that the first 3 decimals are identical.

It can be divided in two parts, 3954 and 47561, that added together give a palindrome (51515).

The spelling of 395447561 in words is "three hundred ninety-five million, four hundred forty-seven thousand, five hundred sixty-one".