31189055 has 4 divisors (see below), whose sum is σ = 37426872. Its totient is φ = 24951240.

The previous prime is 31189049. The next prime is 31189057. The reversal of 31189055 is 55098113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55098113 = 7 ⋅7871159.

It is not a de Polignac number, because 31189055 - 2⁶ = 31188991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31189057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3118901 + ... + 3118910.

It is an arithmetic number, because the mean of its divisors is an integer number (9356718).

Almost surely, 2^31189055 is an apocalyptic number.

31189055 is a deficient number, since it is larger than the sum of its proper divisors (6237817).

31189055 is an equidigital number, since it uses as much as digits as its factorization.

31189055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6237816.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 31189055 is about 5584.7161969074. The cubic root of 31189055 is about 314.7753668484.

The spelling of 31189055 in words is "thirty-one million, one hundred eighty-nine thousand, fifty-five".