1720231 has 2 divisors, whose sum is σ = 1720232. Its totient is φ = 1720230.

The previous prime is 1720223. The next prime is 1720273. The reversal of 1720231 is 1320271.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1720231 - 2³ = 1720223 is a prime.

It is a super-2 number, since 2×1720231² = 5918389386722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860115 + 860116.

It is an arithmetic number, because the mean of its divisors is an integer number (860116).

2^1720231 is an apocalyptic number.

1720231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720231 is an equidigital number, since it uses as much as digits as its factorization.

1720231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1720231 is about 1311.5757698280. The cubic root of 1720231 is about 119.8198918477.

The spelling of 1720231 in words is "one million, seven hundred twenty thousand, two hundred thirty-one".