55425709 has 4 divisors (see below), whose sum is σ = 55916316. Its totient is φ = 54935104.

The previous prime is 55425701. The next prime is 55425719. The reversal of 55425709 is 90752455.

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 4088484 + 51337225 = 2022^2 + 7165^2 .

It is a cyclic number.

It is not a de Polignac number, because 55425709 - 2³ = 55425701 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 (55425701) 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, 245134 + ... + 245359.

It is an arithmetic number, because the mean of its divisors is an integer number (13979079).

Almost surely, 2^55425709 is an apocalyptic number.

It is an amenable number.

55425709 is a deficient number, since it is larger than the sum of its proper divisors (490607).

55425709 is a wasteful number, since it uses less digits than its factorization.

55425709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490606.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 55425709 is about 7444.8444577439. The cubic root of 55425709 is about 381.2739078799.

The spelling of 55425709 in words is "fifty-five million, four hundred twenty-five thousand, seven hundred nine".