7191254561 has 2 divisors, whose sum is σ = 7191254562. Its totient is φ = 7191254560.

The previous prime is 7191254531. The next prime is 7191254579. The reversal of 7191254561 is 1654521917.

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., 7173243025 + 18011536 = 84695^2 + 4244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7191254561 is a prime.

It is a super-2 number, since 2×7191254561² (a number of 21 digits) 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 (7191254531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3595627280 + 3595627281.

It is an arithmetic number, because the mean of its divisors is an integer number (3595627281).

Almost surely, 2^7191254561 is an apocalyptic number.

It is an amenable number.

7191254561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7191254561 is an equidigital number, since it uses as much as digits as its factorization.

7191254561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 41.

The square root of 7191254561 is about 84801.2650907992. The cubic root of 7191254561 is about 1930.1966349987.

The spelling of 7191254561 in words is "seven billion, one hundred ninety-one million, two hundred fifty-four thousand, five hundred sixty-one".