7791551 has 2 divisors, whose sum is σ = 7791552. Its totient is φ = 7791550.

The previous prime is 7791529. The next prime is 7791569. The reversal of 7791551 is 1551977.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7791551 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7791451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3895775 + 3895776.

It is an arithmetic number, because the mean of its divisors is an integer number (3895776).

Almost surely, 2^7791551 is an apocalyptic number.

7791551 is a deficient number, since it is larger than the sum of its proper divisors (1).

7791551 is an equidigital number, since it uses as much as digits as its factorization.

7791551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11025, while the sum is 35.

The square root of 7791551 is about 2791.3349852714. The cubic root of 7791551 is about 198.2476155886.

The spelling of 7791551 in words is "seven million, seven hundred ninety-one thousand, five hundred fifty-one".