31332397 has 2 divisors, whose sum is σ = 31332398. Its totient is φ = 31332396.

The previous prime is 31332359. The next prime is 31332421. The reversal of 31332397 is 79323313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22005481 + 9326916 = 4691^2 + 3054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31332397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31332307) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15666198 + 15666199.

It is an arithmetic number, because the mean of its divisors is an integer number (15666199).

Almost surely, 2^31332397 is an apocalyptic number.

It is an amenable number.

31332397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31332397 is an equidigital number, since it uses as much as digits as its factorization.

31332397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 31.

The square root of 31332397 is about 5597.5349038662. The cubic root of 31332397 is about 315.2568560901.

The spelling of 31332397 in words is "thirty-one million, three hundred thirty-two thousand, three hundred ninety-seven".