55717609 has 4 divisors (see below), whose sum is σ = 55815760. Its totient is φ = 55619460.

The previous prime is 55717603. The next prime is 55717631. The reversal of 55717609 is 90671755.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90671755 = 5 ⋅18134351.

It is a cyclic number.

It is not a de Polignac number, because 55717609 - 2⁵ = 55717577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55717603) 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, 48219 + ... + 49360.

It is an arithmetic number, because the mean of its divisors is an integer number (13953940).

Almost surely, 2^55717609 is an apocalyptic number.

It is an amenable number.

55717609 is a deficient number, since it is larger than the sum of its proper divisors (98151).

55717609 is an equidigital number, since it uses as much as digits as its factorization.

55717609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98150.

The product of its (nonzero) digits is 66150, while the sum is 40.

The square root of 55717609 is about 7464.4228845906. The cubic root of 55717609 is about 381.9420637993.

The spelling of 55717609 in words is "fifty-five million, seven hundred seventeen thousand, six hundred nine".