31147189 has 4 divisors (see below), whose sum is σ = 32221260. Its totient is φ = 30073120.

The previous prime is 31147183. The next prime is 31147201. The reversal of 31147189 is 98174113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17766225 + 13380964 = 4215^2 + 3658^2 .

It is a cyclic number.

It is not a de Polignac number, because 31147189 - 2⁹ = 31146677 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 (31147183) 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, 536992 + ... + 537049.

It is an arithmetic number, because the mean of its divisors is an integer number (8055315).

Almost surely, 2^31147189 is an apocalyptic number.

It is an amenable number.

31147189 is a deficient number, since it is larger than the sum of its proper divisors (1074071).

31147189 is a wasteful number, since it uses less digits than its factorization.

31147189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074070.

The product of its digits is 6048, while the sum is 34.

The square root of 31147189 is about 5580.9666725398. The cubic root of 31147189 is about 314.6344596563.

The spelling of 31147189 in words is "thirty-one million, one hundred forty-seven thousand, one hundred eighty-nine".