7897191551 has 2 divisors, whose sum is σ = 7897191552. Its totient is φ = 7897191550.

The previous prime is 7897191469. The next prime is 7897191571. The reversal of 7897191551 is 1551917987.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7897191551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7897191493 and 7897191502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7897191571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3948595775 + 3948595776.

It is an arithmetic number, because the mean of its divisors is an integer number (3948595776).

Almost surely, 2^7897191551 is an apocalyptic number.

7897191551 is a deficient number, since it is larger than the sum of its proper divisors (1).

7897191551 is an equidigital number, since it uses as much as digits as its factorization.

7897191551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 53.

The square root of 7897191551 is about 88866.1440088406. The cubic root of 7897191551 is about 1991.3956650449.

The spelling of 7897191551 in words is "seven billion, eight hundred ninety-seven million, one hundred ninety-one thousand, five hundred fifty-one".