55287291 has 24 divisors (see below), whose sum is σ = 77279232. Its totient is φ = 35154000.

The previous prime is 55287259. The next prime is 55287313. The reversal of 55287291 is 19278255.

It is not a de Polignac number, because 55287291 - 2⁵ = 55287259 is a prime.

It is a super-2 number, since 2×55287291² = 6113369092237362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55287251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 366066 + ... + 366216.

It is an arithmetic number, because the mean of its divisors is an integer number (3219968).

Almost surely, 2^55287291 is an apocalyptic number.

55287291 is a deficient number, since it is larger than the sum of its proper divisors (21991941).

55287291 is a wasteful number, since it uses less digits than its factorization.

55287291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 312 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The square root of 55287291 is about 7435.5424146460. The cubic root of 55287291 is about 380.9562504446.

The spelling of 55287291 in words is "fifty-five million, two hundred eighty-seven thousand, two hundred ninety-one".