88209561 has 16 divisors (see below), whose sum is σ = 132730560. Its totient is φ = 51616320.

The previous prime is 88209559. The next prime is 88209581. The reversal of 88209561 is 16590288.

It is not a de Polignac number, because 88209561 - 2¹ = 88209559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (88209521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45130 + ... + 47043.

It is an arithmetic number, because the mean of its divisors is an integer number (8295660).

Almost surely, 2^88209561 is an apocalyptic number.

It is an amenable number.

88209561 is a deficient number, since it is larger than the sum of its proper divisors (44520999).

88209561 is a wasteful number, since it uses less digits than its factorization.

88209561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92216.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 88209561 is about 9391.9945166083. The cubic root of 88209561 is about 445.1488135883.

It can be divided in two parts, 8820 and 9561, that added together give a palindrome (18381).

The spelling of 88209561 in words is "eighty-eight million, two hundred nine thousand, five hundred sixty-one".