108720551 has 4 divisors (see below), whose sum is σ = 108746232. Its totient is φ = 108694872.

The previous prime is 108720533. The next prime is 108720553. The reversal of 108720551 is 155027801.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108720551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108720553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4820 + ... + 15513.

It is an arithmetic number, because the mean of its divisors is an integer number (27186558).

Almost surely, 2^108720551 is an apocalyptic number.

108720551 is a deficient number, since it is larger than the sum of its proper divisors (25681).

108720551 is an equidigital number, since it uses as much as digits as its factorization.

108720551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25680.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 108720551 is about 10426.9147402288. The cubic root of 108720551 is about 477.2770462123.

The spelling of 108720551 in words is "one hundred eight million, seven hundred twenty thousand, five hundred fifty-one".