55572331 has 2 divisors, whose sum is σ = 55572332. Its totient is φ = 55572330.

The previous prime is 55572329. The next prime is 55572353. The reversal of 55572331 is 13327555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55572331 - 2¹ = 55572329 is a prime.

It is a super-2 number, since 2×55572331² = 6176567945547122, which contains 22 as substring.

Together with 55572329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 55572293 and 55572302.

It is not a weakly prime, because it can be changed into another prime (55552331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27786165 + 27786166.

It is an arithmetic number, because the mean of its divisors is an integer number (27786166).

Almost surely, 2^55572331 is an apocalyptic number.

55572331 is a deficient number, since it is larger than the sum of its proper divisors (1).

55572331 is an equidigital number, since it uses as much as digits as its factorization.

55572331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15750, while the sum is 31.

The square root of 55572331 is about 7454.6851710854. The cubic root of 55572331 is about 381.6098164998.

Adding to 55572331 its reverse (13327555), we get a palindrome (68899886).

The spelling of 55572331 in words is "fifty-five million, five hundred seventy-two thousand, three hundred thirty-one".