38507561 has 2 divisors, whose sum is σ = 38507562. Its totient is φ = 38507560.

The previous prime is 38507519. The next prime is 38507593. The reversal of 38507561 is 16570583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20529961 + 17977600 = 4531^2 + 4240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38507561 is a prime.

It is not a weakly prime, because it can be changed into another prime (38507501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19253780 + 19253781.

It is an arithmetic number, because the mean of its divisors is an integer number (19253781).

Almost surely, 2^38507561 is an apocalyptic number.

It is an amenable number.

38507561 is a deficient number, since it is larger than the sum of its proper divisors (1).

38507561 is an equidigital number, since it uses as much as digits as its factorization.

38507561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 38507561 is about 6205.4460758273. The cubic root of 38507561 is about 337.6877740643.

It can be divided in two parts, 3850 and 7561, that added together give a palindrome (11411).

The spelling of 38507561 in words is "thirty-eight million, five hundred seven thousand, five hundred sixty-one".