7191135649 has 2 divisors, whose sum is σ = 7191135650. Its totient is φ = 7191135648.

The previous prime is 7191135647. The next prime is 7191135683. The reversal of 7191135649 is 9465311917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5421671424 + 1769464225 = 73632^2 + 42065^2 .

It is a cyclic number.

It is not a de Polignac number, because 7191135649 - 2¹ = 7191135647 is a prime.

It is a super-3 number, since 3×7191135649³ (a number of 31 digits) contains 333 as substring.

Together with 7191135647, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 7191135599 and 7191135608.

It is not a weakly prime, because it can be changed into another prime (7191135647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3595567824 + 3595567825.

It is an arithmetic number, because the mean of its divisors is an integer number (3595567825).

Almost surely, 2^7191135649 is an apocalyptic number.

It is an amenable number.

7191135649 is a deficient number, since it is larger than the sum of its proper divisors (1).

7191135649 is an equidigital number, since it uses as much as digits as its factorization.

7191135649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 46.

The square root of 7191135649 is about 84800.5639662850. The cubic root of 7191135649 is about 1930.1859959275.

The spelling of 7191135649 in words is "seven billion, one hundred ninety-one million, one hundred thirty-five thousand, six hundred forty-nine".