122087561 has 4 divisors (see below), whose sum is σ = 122113092. Its totient is φ = 122062032.

The previous prime is 122087549. The next prime is 122087569. The reversal of 122087561 is 165780221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45630025 + 76457536 = 6755^2 + 8744^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122087561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (122087569) 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 3 ways as a sum of consecutive naturals, for example, 3206 + ... + 15951.

It is an arithmetic number, because the mean of its divisors is an integer number (30528273).

Almost surely, 2^122087561 is an apocalyptic number.

It is an amenable number.

122087561 is a deficient number, since it is larger than the sum of its proper divisors (25531).

122087561 is an equidigital number, since it uses as much as digits as its factorization.

122087561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25530.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 122087561 is about 11049.3240064721. The cubic root of 122087561 is about 496.0861921513.

The spelling of 122087561 in words is "one hundred twenty-two million, eighty-seven thousand, five hundred sixty-one".