55090709 has 4 divisors (see below), whose sum is σ = 57990240. Its totient is φ = 52191180.

The previous prime is 55090699. The next prime is 55090741. The reversal of 55090709 is 90709055.

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.

It is a cyclic number.

It is not a de Polignac number, because 55090709 - 2²⁴ = 38313493 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 (55090309) 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, 1449737 + ... + 1449774.

It is an arithmetic number, because the mean of its divisors is an integer number (14497560).

Almost surely, 2^55090709 is an apocalyptic number.

It is an amenable number.

55090709 is a deficient number, since it is larger than the sum of its proper divisors (2899531).

55090709 is a wasteful number, since it uses less digits than its factorization.

55090709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899530.

The product of its (nonzero) digits is 14175, while the sum is 35.

The square root of 55090709 is about 7422.3115671602. The cubic root of 55090709 is about 380.5041991337.

The spelling of 55090709 in words is "fifty-five million, ninety thousand, seven hundred nine".