31972273 has 2 divisors, whose sum is σ = 31972274. Its totient is φ = 31972272.

The previous prime is 31972229. The next prime is 31972279. The reversal of 31972273 is 37227913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20493729 + 11478544 = 4527^2 + 3388^2 .

It is a cyclic number.

It is not a de Polignac number, because 31972273 - 2⁹ = 31971761 is a prime.

It is equal to p_1972195 and since 31972273 and 1972195 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31972279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15986136 + 15986137.

It is an arithmetic number, because the mean of its divisors is an integer number (15986137).

Almost surely, 2^31972273 is an apocalyptic number.

It is an amenable number.

31972273 is a deficient number, since it is larger than the sum of its proper divisors (1).

31972273 is an equidigital number, since it uses as much as digits as its factorization.

31972273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 34.

The square root of 31972273 is about 5654.4029746738. The cubic root of 31972273 is about 317.3884883368.

The spelling of 31972273 in words is "thirty-one million, nine hundred seventy-two thousand, two hundred seventy-three".