561671447 has 2 divisors, whose sum is σ = 561671448. Its totient is φ = 561671446.

The previous prime is 561671413. The next prime is 561671459. The reversal of 561671447 is 744176165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561671447 - 2¹⁶ = 561605911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561671147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280835723 + 280835724.

It is an arithmetic number, because the mean of its divisors is an integer number (280835724).

Almost surely, 2^561671447 is an apocalyptic number.

561671447 is a deficient number, since it is larger than the sum of its proper divisors (1).

561671447 is an equidigital number, since it uses as much as digits as its factorization.

561671447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 561671447 is about 23699.6085832657. The cubic root of 561671447 is about 825.0763061346.

The spelling of 561671447 in words is "five hundred sixty-one million, six hundred seventy-one thousand, four hundred forty-seven".