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31317983 is a prime number
BaseRepresentation
bin111011101110…
…1111111011111
32011221010012022
41313131333133
531004133413
63035130355
7530125034
oct167357737
964833168
1031317983
1116750734
12a5a39bb
136646b68
14423338b
152b39608
hex1dddfdf

31317983 has 2 divisors, whose sum is σ = 31317984. Its totient is φ = 31317982.

The previous prime is 31317977. The next prime is 31318003. The reversal of 31317983 is 38971313.

It is a weak prime.

It is an emirp because it is prime and its reverse (38971313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31317983 - 216 = 31252447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31317953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15658991 + 15658992.

It is an arithmetic number, because the mean of its divisors is an integer number (15658992).

Almost surely, 231317983 is an apocalyptic number.

31317983 is a deficient number, since it is larger than the sum of its proper divisors (1).

31317983 is an equidigital number, since it uses as much as digits as its factorization.

31317983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 31317983 is about 5596.2472247034. The cubic root of 31317983 is about 315.2085056100.

The spelling of 31317983 in words is "thirty-one million, three hundred seventeen thousand, nine hundred eighty-three".