31201189 has 2 divisors, whose sum is σ = 31201190. Its totient is φ = 31201188.

The previous prime is 31201169. The next prime is 31201193. The reversal of 31201189 is 98110213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23444964 + 7756225 = 4842^2 + 2785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31201189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31201109) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600594 + 15600595.

It is an arithmetic number, because the mean of its divisors is an integer number (15600595).

Almost surely, 2^31201189 is an apocalyptic number.

It is an amenable number.

31201189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31201189 is an equidigital number, since it uses as much as digits as its factorization.

31201189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 31201189 is about 5585.8024490667. The cubic root of 31201189 is about 314.8161823320.

The spelling of 31201189 in words is "thirty-one million, two hundred one thousand, one hundred eighty-nine".