109551605 has 4 divisors (see below), whose sum is σ = 131461932. Its totient is φ = 87641280.

The previous prime is 109551593. The next prime is 109551619. The reversal of 109551605 is 506155901.

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 85951441 + 23600164 = 9271^2 + 4858^2 .

It is not a de Polignac number, because 109551605 - 2¹² = 109547509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10955156 + ... + 10955165.

It is an arithmetic number, because the mean of its divisors is an integer number (32865483).

Almost surely, 2^109551605 is an apocalyptic number.

It is an amenable number.

109551605 is a deficient number, since it is larger than the sum of its proper divisors (21910327).

109551605 is an equidigital number, since it uses as much as digits as its factorization.

109551605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21910326.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 109551605 is about 10466.6902600583. The cubic root of 109551605 is about 478.4900540125.

The spelling of 109551605 in words is "one hundred nine million, five hundred fifty-one thousand, six hundred five".