31942289 has 2 divisors, whose sum is σ = 31942290. Its totient is φ = 31942288.

The previous prime is 31942271. The next prime is 31942319. The reversal of 31942289 is 98224913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31730689 + 211600 = 5633^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 31942289 - 2⁸ = 31942033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31942259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15971144 + 15971145.

It is an arithmetic number, because the mean of its divisors is an integer number (15971145).

Almost surely, 2^31942289 is an apocalyptic number.

It is an amenable number.

31942289 is a deficient number, since it is larger than the sum of its proper divisors (1).

31942289 is an equidigital number, since it uses as much as digits as its factorization.

31942289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 31942289 is about 5651.7509676206. The cubic root of 31942289 is about 317.2892403320.

The spelling of 31942289 in words is "thirty-one million, nine hundred forty-two thousand, two hundred eighty-nine".