31397243 has 2 divisors, whose sum is σ = 31397244. Its totient is φ = 31397242.

The previous prime is 31397221. The next prime is 31397273. The reversal of 31397243 is 34279313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31397243 - 2¹⁴ = 31380859 is a prime.

It is not a weakly prime, because it can be changed into another prime (31397213) 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, 15698621 + 15698622.

It is an arithmetic number, because the mean of its divisors is an integer number (15698622).

Almost surely, 2^31397243 is an apocalyptic number.

31397243 is a deficient number, since it is larger than the sum of its proper divisors (1).

31397243 is an equidigital number, since it uses as much as digits as its factorization.

31397243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 32.

The square root of 31397243 is about 5603.3242811745. The cubic root of 31397243 is about 315.4741930011.

The spelling of 31397243 in words is "thirty-one million, three hundred ninety-seven thousand, two hundred forty-three".