387419561 has 2 divisors, whose sum is σ = 387419562. Its totient is φ = 387419560.

The previous prime is 387419509. The next prime is 387419573. The reversal of 387419561 is 165914783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254593936 + 132825625 = 15956^2 + 11525^2 .

It is a cyclic number.

It is not a de Polignac number, because 387419561 - 2¹⁸ = 387157417 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (387419761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193709780 + 193709781.

It is an arithmetic number, because the mean of its divisors is an integer number (193709781).

Almost surely, 2^387419561 is an apocalyptic number.

It is an amenable number.

387419561 is a deficient number, since it is larger than the sum of its proper divisors (1).

387419561 is an equidigital number, since it uses as much as digits as its factorization.

387419561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 387419561 is about 19682.9764263437. The cubic root of 387419561 is about 728.9994179343. Note that the first 3 decimals are identical.

The spelling of 387419561 in words is "three hundred eighty-seven million, four hundred nineteen thousand, five hundred sixty-one".