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31055989 is a prime number
BaseRepresentation
bin111011001111…
…0000001110101
32011102210210211
41312132001311
530422242424
63025345421
7524654146
oct166360165
964383724
1031055989
1116591908
12a498271
136584833
1441a5acd
152ad6b94
hex1d9e075

31055989 has 2 divisors, whose sum is σ = 31055990. Its totient is φ = 31055988.

The previous prime is 31055977. The next prime is 31056029. The reversal of 31055989 is 98955013.

It is an a-pointer prime, because the next prime (31056029) can be obtained adding 31055989 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30713764 + 342225 = 5542^2 + 585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-31055989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31055909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15527994 + 15527995.

It is an arithmetic number, because the mean of its divisors is an integer number (15527995).

Almost surely, 231055989 is an apocalyptic number.

It is an amenable number.

31055989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31055989 is an equidigital number, since it uses as much as digits as its factorization.

31055989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 31055989 is about 5572.7900552596. The cubic root of 31055989 is about 314.3270727449.

The spelling of 31055989 in words is "thirty-one million, fifty-five thousand, nine hundred eighty-nine".