31530189 has 24 divisors (see below), whose sum is σ = 45799488. Its totient is φ = 19279360.

The previous prime is 31530181. The next prime is 31530197. The reversal of 31530189 is 98103513.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31530181) and next prime (31530197).

It is not a de Polignac number, because 31530189 - 2³ = 31530181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31530181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35104 + ... + 35990.

It is an arithmetic number, because the mean of its divisors is an integer number (1908312).

Almost surely, 2^31530189 is an apocalyptic number.

It is an amenable number.

31530189 is a deficient number, since it is larger than the sum of its proper divisors (14269299).

31530189 is a wasteful number, since it uses less digits than its factorization.

31530189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965 (or 948 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 31530189 is about 5615.1748859675. The cubic root of 31530189 is about 315.9188389813.

The spelling of 31530189 in words is "thirty-one million, five hundred thirty thousand, one hundred eighty-nine".