109487561 has 4 divisors (see below), whose sum is σ = 110185092. Its totient is φ = 108790032.

The previous prime is 109487527. The next prime is 109487569. The reversal of 109487561 is 165784901.

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 46840336 + 62647225 = 6844^2 + 7915^2 .

It is a cyclic number.

It is not a de Polignac number, because 109487561 - 2¹⁰ = 109486537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109487569) 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, 348530 + ... + 348843.

It is an arithmetic number, because the mean of its divisors is an integer number (27546273).

Almost surely, 2^109487561 is an apocalyptic number.

It is an amenable number.

109487561 is a deficient number, since it is larger than the sum of its proper divisors (697531).

109487561 is an equidigital number, since it uses as much as digits as its factorization.

109487561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697530.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 109487561 is about 10463.6303929372. The cubic root of 109487561 is about 478.3967938832.

The spelling of 109487561 in words is "one hundred nine million, four hundred eighty-seven thousand, five hundred sixty-one".