55291393 has 4 divisors (see below), whose sum is σ = 55630768. Its totient is φ = 54952020.

The previous prime is 55291351. The next prime is 55291403. The reversal of 55291393 is 39319255.

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: 39319255 = 5 ⋅7863851.

It is a cyclic number.

It is not a de Polignac number, because 55291393 - 2⁹ = 55290881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55291343) 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, 169443 + ... + 169768.

It is an arithmetic number, because the mean of its divisors is an integer number (13907692).

Almost surely, 2^55291393 is an apocalyptic number.

It is an amenable number.

55291393 is a deficient number, since it is larger than the sum of its proper divisors (339375).

55291393 is a wasteful number, since it uses less digits than its factorization.

55291393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339374.

The product of its digits is 36450, while the sum is 37.

The square root of 55291393 is about 7435.8182468374. The cubic root of 55291393 is about 380.9656718014.

The spelling of 55291393 in words is "fifty-five million, two hundred ninety-one thousand, three hundred ninety-three".