55291291 has 8 divisors (see below), whose sum is σ = 60427584. Its totient is φ = 50173320.

The previous prime is 55291213. The next prime is 55291297. The reversal of 55291291 is 19219255.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55291291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55291297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2176 + ... + 10738.

It is an arithmetic number, because the mean of its divisors is an integer number (7553448).

Almost surely, 2^55291291 is an apocalyptic number.

55291291 is a deficient number, since it is larger than the sum of its proper divisors (5136293).

55291291 is a wasteful number, since it uses less digits than its factorization.

55291291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9161.

The product of its digits is 8100, while the sum is 34.

The square root of 55291291 is about 7435.8113881405. The cubic root of 55291291 is about 380.9654375364.

Subtracting from 55291291 its reverse (19219255), we obtain a square (36072036 = 6006²).

The spelling of 55291291 in words is "fifty-five million, two hundred ninety-one thousand, two hundred ninety-one".