31252189 has 2 divisors, whose sum is σ = 31252190. Its totient is φ = 31252188.

The previous prime is 31252183. The next prime is 31252201. The reversal of 31252189 is 98125213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28708164 + 2544025 = 5358^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 31252189 - 2³ = 31252181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31252189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31252181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15626094 + 15626095.

It is an arithmetic number, because the mean of its divisors is an integer number (15626095).

Almost surely, 2^31252189 is an apocalyptic number.

It is an amenable number.

31252189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31252189 is an equidigital number, since it uses as much as digits as its factorization.

31252189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 31252189 is about 5590.3657304330. The cubic root of 31252189 is about 314.9876168811.

The spelling of 31252189 in words is "thirty-one million, two hundred fifty-two thousand, one hundred eighty-nine".