31272289 has 4 divisors (see below), whose sum is σ = 32117524. Its totient is φ = 30427056.

The previous prime is 31272287. The next prime is 31272313. The reversal of 31272289 is 98227213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28998225 + 2274064 = 5385^2 + 1508^2 .

It is a cyclic number.

It is not a de Polignac number, because 31272289 - 2¹ = 31272287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31272287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422562 + ... + 422635.

It is an arithmetic number, because the mean of its divisors is an integer number (8029381).

Almost surely, 2^31272289 is an apocalyptic number.

It is an amenable number.

31272289 is a deficient number, since it is larger than the sum of its proper divisors (845235).

31272289 is an equidigital number, since it uses as much as digits as its factorization.

31272289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845234.

The product of its digits is 12096, while the sum is 34.

The square root of 31272289 is about 5592.1631771614. The cubic root of 31272289 is about 315.0551310240.

The spelling of 31272289 in words is "thirty-one million, two hundred seventy-two thousand, two hundred eighty-nine".