55161331 has 4 divisors (see below), whose sum is σ = 55176352. Its totient is φ = 55146312.

The previous prime is 55161329. The next prime is 55161371. The reversal of 55161331 is 13316155.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13316155 = 5 ⋅2663231.

It is a cyclic number.

It is not a de Polignac number, because 55161331 - 2¹ = 55161329 is a prime.

It is a super-2 number, since 2×55161331² = 6085544875383122, 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 = 55161296 and 55161305.

It is not an unprimeable number, because it can be changed into a prime (55161371) 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, 2086 + ... + 10708.

It is an arithmetic number, because the mean of its divisors is an integer number (13794088).

Almost surely, 2^55161331 is an apocalyptic number.

55161331 is a deficient number, since it is larger than the sum of its proper divisors (15021).

55161331 is an equidigital number, since it uses as much as digits as its factorization.

55161331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15020.

The product of its digits is 1350, while the sum is 25.

The square root of 55161331 is about 7427.0674562710. The cubic root of 55161331 is about 380.6667219596. Note that the first 3 decimals are identical.

Adding to 55161331 its reverse (13316155), we get a palindrome (68477486).

The spelling of 55161331 in words is "fifty-five million, one hundred sixty-one thousand, three hundred thirty-one".