7191149281 has 2 divisors, whose sum is σ = 7191149282. Its totient is φ = 7191149280.

The previous prime is 7191149263. The next prime is 7191149297. The reversal of 7191149281 is 1829411917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5637607056 + 1553542225 = 75084^2 + 39415^2 .

It is a cyclic number.

It is not a de Polignac number, because 7191149281 - 2⁷ = 7191149153 is a prime.

It is a super-2 number, since 2×7191149281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7191149201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3595574640 + 3595574641.

It is an arithmetic number, because the mean of its divisors is an integer number (3595574641).

Almost surely, 2^7191149281 is an apocalyptic number.

It is an amenable number.

7191149281 is a deficient number, since it is larger than the sum of its proper divisors (1).

7191149281 is an equidigital number, since it uses as much as digits as its factorization.

7191149281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 43.

The square root of 7191149281 is about 84800.6443430709. The cubic root of 7191149281 is about 1930.1872155902.

The spelling of 7191149281 in words is "seven billion, one hundred ninety-one million, one hundred forty-nine thousand, two hundred eighty-one".