1720167551 has 2 divisors, whose sum is σ = 1720167552. Its totient is φ = 1720167550.

The previous prime is 1720167529. The next prime is 1720167569. The reversal of 1720167551 is 1557610271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720167551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720167521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860083775 + 860083776.

It is an arithmetic number, because the mean of its divisors is an integer number (860083776).

Almost surely, 2^1720167551 is an apocalyptic number.

1720167551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720167551 is an equidigital number, since it uses as much as digits as its factorization.

1720167551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14700, while the sum is 35.

The square root of 1720167551 is about 41474.9026641414. The cubic root of 1720167551 is about 1198.1841868399.

The spelling of 1720167551 in words is "one billion, seven hundred twenty million, one hundred sixty-seven thousand, five hundred fifty-one".