31272797 has 2 divisors, whose sum is σ = 31272798. Its totient is φ = 31272796.

The previous prime is 31272779. The next prime is 31272811. The reversal of 31272797 is 79727213.

Together with previous prime (31272779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20376196 + 10896601 = 4514^2 + 3301^2 .

It is an emirp because it is prime and its reverse (79727213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31272797 - 2¹⁶ = 31207261 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31272797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31272737) 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, 15636398 + 15636399.

It is an arithmetic number, because the mean of its divisors is an integer number (15636399).

Almost surely, 2^31272797 is an apocalyptic number.

It is an amenable number.

31272797 is a deficient number, since it is larger than the sum of its proper divisors (1).

31272797 is an equidigital number, since it uses as much as digits as its factorization.

31272797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37044, while the sum is 38.

The square root of 31272797 is about 5592.2085976830. The cubic root of 31272797 is about 315.0568369767.

The spelling of 31272797 in words is "thirty-one million, two hundred seventy-two thousand, seven hundred ninety-seven".