31302189 has 12 divisors (see below), whose sum is σ = 45504316. Its totient is φ = 20734272.

The previous prime is 31302179. The next prime is 31302197. The reversal of 31302189 is 98120313.

It can be written as a sum of positive squares in 2 ways, for example, as 4862025 + 26440164 = 2205^2 + 5142^2 .

It is not a de Polignac number, because 31302189 - 2¹¹ = 31300141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31302109) 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, 9664 + ... + 12489.

Almost surely, 2^31302189 is an apocalyptic number.

It is an amenable number.

31302189 is a deficient number, since it is larger than the sum of its proper divisors (14202127).

31302189 is a wasteful number, since it uses less digits than its factorization.

31302189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22316 (or 22313 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 31302189 is about 5594.8359225271. The cubic root of 31302189 is about 315.1555090056.

The spelling of 31302189 in words is "thirty-one million, three hundred two thousand, one hundred eighty-nine".