31872149 has 2 divisors, whose sum is σ = 31872150. Its totient is φ = 31872148.

The previous prime is 31872121. The next prime is 31872151. The reversal of 31872149 is 94127813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28281124 + 3591025 = 5318^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 31872149 - 2⁸ = 31871893 is a prime.

Together with 31872151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31872119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15936074 + 15936075.

It is an arithmetic number, because the mean of its divisors is an integer number (15936075).

Almost surely, 2^31872149 is an apocalyptic number.

It is an amenable number.

31872149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31872149 is an equidigital number, since it uses as much as digits as its factorization.

31872149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 31872149 is about 5645.5424008681. The cubic root of 31872149 is about 317.0568318530.

The spelling of 31872149 in words is "thirty-one million, eight hundred seventy-two thousand, one hundred forty-nine".