83887561 has 2 divisors, whose sum is σ = 83887562. Its totient is φ = 83887560.

The previous prime is 83887541. The next prime is 83887577. The reversal of 83887561 is 16578838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83832336 + 55225 = 9156^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 83887561 - 2²³ = 75498953 is a prime.

It is equal to p_4882888 and since 83887561 and 4882888 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (83887541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41943780 + 41943781.

It is an arithmetic number, because the mean of its divisors is an integer number (41943781).

Almost surely, 2^83887561 is an apocalyptic number.

It is an amenable number.

83887561 is a deficient number, since it is larger than the sum of its proper divisors (1).

83887561 is an equidigital number, since it uses as much as digits as its factorization.

83887561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 83887561 is about 9159.0152854988. The cubic root of 83887561 is about 437.7564185002.

It can be divided in two parts, 83887 and 561, that added together give a palindrome (84448).

The spelling of 83887561 in words is "eighty-three million, eight hundred eighty-seven thousand, five hundred sixty-one".