7191281 has 2 divisors, whose sum is σ = 7191282. Its totient is φ = 7191280.

The previous prime is 7191251. The next prime is 7191293. The reversal of 7191281 is 1821917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6806881 + 384400 = 2609^2 + 620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7191281 is a prime.

It is a super-2 number, since 2×7191281² = 103429044841922, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (7191211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3595640 + 3595641.

It is an arithmetic number, because the mean of its divisors is an integer number (3595641).

Almost surely, 2^7191281 is an apocalyptic number.

It is an amenable number.

7191281 is a deficient number, since it is larger than the sum of its proper divisors (1).

7191281 is an equidigital number, since it uses as much as digits as its factorization.

7191281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 29.

The square root of 7191281 is about 2681.6563911135. The cubic root of 7191281 is about 193.0199000483.

The spelling of 7191281 in words is "seven million, one hundred ninety-one thousand, two hundred eighty-one".