31328797 has 6 divisors (see below), whose sum is σ = 32113274. Its totient is φ = 30563040.

The previous prime is 31328779. The next prime is 31328809. The reversal of 31328797 is 79782313.

It can be written as a sum of positive squares in 3 ways, for example, as 8231161 + 23097636 = 2869^2 + 4806^2 .

It is not a de Polignac number, because 31328797 - 2¹¹ = 31326749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31328707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7638 + ... + 10999.

Almost surely, 2^31328797 is an apocalyptic number.

It is an amenable number.

31328797 is a deficient number, since it is larger than the sum of its proper divisors (784477).

31328797 is an equidigital number, since it uses as much as digits as its factorization.

31328797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18719 (or 18678 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The square root of 31328797 is about 5597.2133245035. The cubic root of 31328797 is about 315.2447816000.

The spelling of 31328797 in words is "thirty-one million, three hundred twenty-eight thousand, seven hundred ninety-seven".