31189149 has 12 divisors (see below), whose sum is σ = 45339996. Its totient is φ = 20659392.

The previous prime is 31189133. The next prime is 31189183. The reversal of 31189149 is 94198113.

It can be written as a sum of positive squares in 2 ways, for example, as 21622500 + 9566649 = 4650^2 + 3093^2 .

It is not a de Polignac number, because 31189149 - 2⁴ = 31189133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31189129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9624 + ... + 12449.

It is an arithmetic number, because the mean of its divisors is an integer number (3778333).

Almost surely, 2^31189149 is an apocalyptic number.

It is an amenable number.

31189149 is a deficient number, since it is larger than the sum of its proper divisors (14150847).

31189149 is a wasteful number, since it uses less digits than its factorization.

31189149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22236 (or 22233 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 31189149 is about 5584.7246127271. The cubic root of 31189149 is about 314.7756830795.

The spelling of 31189149 in words is "thirty-one million, one hundred eighty-nine thousand, one hundred forty-nine".