55251331 has 4 divisors (see below), whose sum is σ = 57033664. Its totient is φ = 53469000.

The previous prime is 55251307. The next prime is 55251347. The reversal of 55251331 is 13315255.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13315255 = 5 ⋅2663051.

It is a cyclic number.

It is not a de Polignac number, because 55251331 - 2¹⁵ = 55218563 is a prime.

It is a super-2 number, since 2×55251331² = 6105419154543122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55251296 and 55251305.

It is not an unprimeable number, because it can be changed into a prime (55251631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 891120 + ... + 891181.

It is an arithmetic number, because the mean of its divisors is an integer number (14258416).

Almost surely, 2^55251331 is an apocalyptic number.

55251331 is a deficient number, since it is larger than the sum of its proper divisors (1782333).

55251331 is a wasteful number, since it uses less digits than its factorization.

55251331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782332.

The product of its digits is 2250, while the sum is 25.

The square root of 55251331 is about 7433.1239058689. The cubic root of 55251331 is about 380.8736385841.

Adding to 55251331 its reverse (13315255), we get a palindrome (68566586).

The spelling of 55251331 in words is "fifty-five million, two hundred fifty-one thousand, three hundred thirty-one".