55391306 has 4 divisors (see below), whose sum is σ = 83086962. Its totient is φ = 27695652.

The previous prime is 55391299. The next prime is 55391309. The reversal of 55391306 is 60319355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60319355 = 5 ⋅12063871.

It can be written as a sum of positive squares in only one way, i.e., 33535681 + 21855625 = 5791^2 + 4675^2 .

It is not an unprimeable number, because it can be changed into a prime (55391309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13847825 + ... + 13847828.

Almost surely, 2^55391306 is an apocalyptic number.

55391306 is a deficient number, since it is larger than the sum of its proper divisors (27695656).

55391306 is a wasteful number, since it uses less digits than its factorization.

55391306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27695655.

The product of its (nonzero) digits is 12150, while the sum is 32.

The square root of 55391306 is about 7442.5335739921. The cubic root of 55391306 is about 381.1950053793.

The spelling of 55391306 in words is "fifty-five million, three hundred ninety-one thousand, three hundred six".