55470391 has 4 divisors (see below), whose sum is σ = 55555992. Its totient is φ = 55384792.

The previous prime is 55470361. The next prime is 55470419. The reversal of 55470391 is 19307455.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55470391 - 2⁷ = 55470263 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 (55470361) 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, 41821 + ... + 43126.

It is an arithmetic number, because the mean of its divisors is an integer number (13888998).

Almost surely, 2^55470391 is an apocalyptic number.

55470391 is a deficient number, since it is larger than the sum of its proper divisors (85601).

55470391 is an equidigital number, since it uses as much as digits as its factorization.

55470391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85600.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 55470391 is about 7447.8447217970. The cubic root of 55470391 is about 381.3763363087.

The spelling of 55470391 in words is "fifty-five million, four hundred seventy thousand, three hundred ninety-one".