31340447 has 2 divisors, whose sum is σ = 31340448. Its totient is φ = 31340446.

The previous prime is 31340423. The next prime is 31340453. The reversal of 31340447 is 74404313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31340447 - 2¹⁰ = 31339423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31340417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15670223 + 15670224.

It is an arithmetic number, because the mean of its divisors is an integer number (15670224).

Almost surely, 2^31340447 is an apocalyptic number.

31340447 is a deficient number, since it is larger than the sum of its proper divisors (1).

31340447 is an equidigital number, since it uses as much as digits as its factorization.

31340447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 31340447 is about 5598.2539242160. The cubic root of 31340447 is about 315.2838526456.

The spelling of 31340447 in words is "thirty-one million, three hundred forty thousand, four hundred forty-seven".