38780561 has 2 divisors, whose sum is σ = 38780562. Its totient is φ = 38780560.

The previous prime is 38780557. The next prime is 38780603. The reversal of 38780561 is 16508783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29593600 + 9186961 = 5440^2 + 3031^2 .

It is a cyclic number.

It is not a de Polignac number, because 38780561 - 2² = 38780557 is a prime.

It is a super-2 number, since 2×38780561² = 3007863822949442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38780761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19390280 + 19390281.

It is an arithmetic number, because the mean of its divisors is an integer number (19390281).

Almost surely, 2^38780561 is an apocalyptic number.

It is an amenable number.

38780561 is a deficient number, since it is larger than the sum of its proper divisors (1).

38780561 is an equidigital number, since it uses as much as digits as its factorization.

38780561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 38780561 is about 6227.4040337849. The cubic root of 38780561 is about 338.4839099922.

The spelling of 38780561 in words is "thirty-eight million, seven hundred eighty thousand, five hundred sixty-one".