31421249 has 2 divisors, whose sum is σ = 31421250. Its totient is φ = 31421248.

The previous prime is 31421233. The next prime is 31421279. The reversal of 31421249 is 94212413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19963024 + 11458225 = 4468^2 + 3385^2 .

It is a cyclic number.

It is not a de Polignac number, because 31421249 - 2⁴ = 31421233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31421279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710624 + 15710625.

It is an arithmetic number, because the mean of its divisors is an integer number (15710625).

Almost surely, 2^31421249 is an apocalyptic number.

It is an amenable number.

31421249 is a deficient number, since it is larger than the sum of its proper divisors (1).

31421249 is an equidigital number, since it uses as much as digits as its factorization.

31421249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 31421249 is about 5605.4659931178. The cubic root of 31421249 is about 315.5545752622.

The spelling of 31421249 in words is "thirty-one million, four hundred twenty-one thousand, two hundred forty-nine".