31863397 has 2 divisors, whose sum is σ = 31863398. Its totient is φ = 31863396.

The previous prime is 31863347. The next prime is 31863407. The reversal of 31863397 is 79336813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31708161 + 155236 = 5631^2 + 394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31863397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31863317) 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, 15931698 + 15931699.

It is an arithmetic number, because the mean of its divisors is an integer number (15931699).

Almost surely, 2^31863397 is an apocalyptic number.

It is an amenable number.

31863397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31863397 is an equidigital number, since it uses as much as digits as its factorization.

31863397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 31863397 is about 5644.7672228357. The cubic root of 31863397 is about 317.0278082330.

The spelling of 31863397 in words is "thirty-one million, eight hundred sixty-three thousand, three hundred ninety-seven".