1720151 has 2 divisors, whose sum is σ = 1720152. Its totient is φ = 1720150.

The previous prime is 1720133. The next prime is 1720157. The reversal of 1720151 is 1510271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720151 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860075 + 860076.

It is an arithmetic number, because the mean of its divisors is an integer number (860076).

2^1720151 is an apocalyptic number.

1720151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720151 is an equidigital number, since it uses as much as digits as its factorization.

1720151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 1720151 is about 1311.5452718073. The cubic root of 1720151 is about 119.8180343956.

The spelling of 1720151 in words is "one million, seven hundred twenty thousand, one hundred fifty-one".