55551331 has 4 divisors (see below), whose sum is σ = 60601464. Its totient is φ = 50501200.

The previous prime is 55551329. The next prime is 55551341. The reversal of 55551331 is 13315555.

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 55551331 - 2¹ = 55551329 is a prime.

It is a super-2 number, since 2×55551331² = 6171900751743122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55551331.

It is not an unprimeable number, because it can be changed into a prime (55551341) 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, 2525050 + ... + 2525071.

It is an arithmetic number, because the mean of its divisors is an integer number (15150366).

Almost surely, 2^55551331 is an apocalyptic number.

55551331 is a deficient number, since it is larger than the sum of its proper divisors (5050133).

55551331 is a wasteful number, since it uses less digits than its factorization.

55551331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5050132.

The product of its digits is 5625, while the sum is 28.

The square root of 55551331 is about 7453.2765278098. The cubic root of 55551331 is about 381.5617421215.

Adding to 55551331 its reverse (13315555), we get a palindrome (68866886).

It can be divided in two parts, 5555 and 1331, that added together give a palindrome (6886).

The spelling of 55551331 in words is "fifty-five million, five hundred fifty-one thousand, three hundred thirty-one".