55430309 has 4 divisors (see below), whose sum is σ = 60469440. Its totient is φ = 50391180.

The previous prime is 55430279. The next prime is 55430321. The reversal of 55430309 is 90303455.

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 55430309 - 2¹² = 55426213 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 (55430369) 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, 2519549 + ... + 2519570.

It is an arithmetic number, because the mean of its divisors is an integer number (15117360).

Almost surely, 2^55430309 is an apocalyptic number.

It is an amenable number.

55430309 is a deficient number, since it is larger than the sum of its proper divisors (5039131).

55430309 is a wasteful number, since it uses less digits than its factorization.

55430309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5039130.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 55430309 is about 7445.1533899578. The cubic root of 55430309 is about 381.2844554007.

The spelling of 55430309 in words is "fifty-five million, four hundred thirty thousand, three hundred nine".