31397143 has 2 divisors, whose sum is σ = 31397144. Its totient is φ = 31397142.

The previous prime is 31397129. The next prime is 31397159. The reversal of 31397143 is 34179313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31397143 - 2¹⁷ = 31266071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31397173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15698571 + 15698572.

It is an arithmetic number, because the mean of its divisors is an integer number (15698572).

Almost surely, 2^31397143 is an apocalyptic number.

31397143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31397143 is an equidigital number, since it uses as much as digits as its factorization.

31397143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 31.

The square root of 31397143 is about 5603.3153578930. The cubic root of 31397143 is about 315.4738580731.

The spelling of 31397143 in words is "thirty-one million, three hundred ninety-seven thousand, one hundred forty-three".