55129289 has 4 divisors (see below), whose sum is σ = 55644624. Its totient is φ = 54613956.

The previous prime is 55129273. The next prime is 55129301. The reversal of 55129289 is 98292155.

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.

It is a cyclic number.

It is not a de Polignac number, because 55129289 - 2⁴ = 55129273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55129219) 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, 257507 + ... + 257720.

It is an arithmetic number, because the mean of its divisors is an integer number (13911156).

Almost surely, 2^55129289 is an apocalyptic number.

It is an amenable number.

55129289 is a deficient number, since it is larger than the sum of its proper divisors (515335).

55129289 is a wasteful number, since it uses less digits than its factorization.

55129289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515334.

The product of its digits is 64800, while the sum is 41.

The square root of 55129289 is about 7424.9100331250. The cubic root of 55129289 is about 380.5930007171.

The spelling of 55129289 in words is "fifty-five million, one hundred twenty-nine thousand, two hundred eighty-nine".