7131281 has 2 divisors, whose sum is σ = 7131282. Its totient is φ = 7131280.

The previous prime is 7131259. The next prime is 7131301. The reversal of 7131281 is 1821317.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6330256 + 801025 = 2516^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 7131281 - 2⁶ = 7131217 is a prime.

It is a super-2 number, since 2×7131281² = 101710337401922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7133281) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3565640 + 3565641.

It is an arithmetic number, because the mean of its divisors is an integer number (3565641).

Almost surely, 2^7131281 is an apocalyptic number.

It is an amenable number.

7131281 is a deficient number, since it is larger than the sum of its proper divisors (1).

7131281 is an equidigital number, since it uses as much as digits as its factorization.

7131281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 23.

The square root of 7131281 is about 2670.4458429259. The cubic root of 7131281 is about 192.4815836657.

Adding to 7131281 its reverse (1821317), we get a palindrome (8952598).

The spelling of 7131281 in words is "seven million, one hundred thirty-one thousand, two hundred eighty-one".