1720161607 has 2 divisors, whose sum is σ = 1720161608. Its totient is φ = 1720161606.

The previous prime is 1720161589. The next prime is 1720161613. The reversal of 1720161607 is 7061610271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720161607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720161617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860080803 + 860080804.

It is an arithmetic number, because the mean of its divisors is an integer number (860080804).

Almost surely, 2^1720161607 is an apocalyptic number.

1720161607 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720161607 is an equidigital number, since it uses as much as digits as its factorization.

1720161607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 1720161607 is about 41474.8310062862. The cubic root of 1720161607 is about 1198.1828067389.

Adding to 1720161607 its reverse (7061610271), we get a palindrome (8781771878).

The spelling of 1720161607 in words is "one billion, seven hundred twenty million, one hundred sixty-one thousand, six hundred seven".