61559099 has 4 divisors (see below), whose sum is σ = 70353264. Its totient is φ = 52764936.

The previous prime is 61559089. The next prime is 61559111. The reversal of 61559099 is 99095516.

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

It is a de Polignac number, because none of the positive numbers 2^k-61559099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61559089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4397072 + ... + 4397085.

It is an arithmetic number, because the mean of its divisors is an integer number (17588316).

Almost surely, 2^61559099 is an apocalyptic number.

61559099 is a deficient number, since it is larger than the sum of its proper divisors (8794165).

61559099 is an equidigital number, since it uses as much as digits as its factorization.

61559099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8794164.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 61559099 is about 7845.9606805031. The cubic root of 61559099 is about 394.8487355436.

The spelling of 61559099 in words is "sixty-one million, five hundred fifty-nine thousand, ninety-nine".