55270391 has 4 divisors (see below), whose sum is σ = 60294984. Its totient is φ = 50245800.

The previous prime is 55270387. The next prime is 55270393. The reversal of 55270391 is 19307255.

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

It is not a de Polignac number, because 55270391 - 2² = 55270387 is a prime.

It is a super-2 number, since 2×55270391² = 6109632242585762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55270393) 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, 2512280 + ... + 2512301.

It is an arithmetic number, because the mean of its divisors is an integer number (15073746).

Almost surely, 2^55270391 is an apocalyptic number.

55270391 is a deficient number, since it is larger than the sum of its proper divisors (5024593).

55270391 is a wasteful number, since it uses less digits than its factorization.

55270391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024592.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 55270391 is about 7434.4058942191. The cubic root of 55270391 is about 380.9174300899.

The spelling of 55270391 in words is "fifty-five million, two hundred seventy thousand, three hundred ninety-one".