Search a number
7281881 is a prime number
BaseRepresentation
bin11011110001110011011001
3111200221212022
4123301303121
53331010011
6420024225
7115615655
oct33616331
914627768
107281881
114123a92
122532075
13167c609
14d77a65
1598c8db
hex6f1cd9

7281881 has 2 divisors, whose sum is σ = 7281882. Its totient is φ = 7281880.

The previous prime is 7281877. The next prime is 7281889. The reversal of 7281881 is 1881827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7070281 + 211600 = 2659^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 7281881 - 22 = 7281877 is a prime.

It is a super-2 number, since 2×72818812 = 106051581796322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7281889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3640940 + 3640941.

It is an arithmetic number, because the mean of its divisors is an integer number (3640941).

Almost surely, 27281881 is an apocalyptic number.

It is an amenable number.

7281881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7281881 is an equidigital number, since it uses as much as digits as its factorization.

7281881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7168, while the sum is 35.

The square root of 7281881 is about 2698.4960626245. The cubic root of 7281881 is about 193.8271124200.

The spelling of 7281881 in words is "seven million, two hundred eighty-one thousand, eight hundred eighty-one".