1722731 has 2 divisors, whose sum is σ = 1722732. Its totient is φ = 1722730.

The previous prime is 1722719. The next prime is 1722737. The reversal of 1722731 is 1372271.

It is a strong prime.

It is an emirp because it is prime and its reverse (1372271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1722731 - 2⁶ = 1722667 is a prime.

It is a super-2 number, since 2×1722731² = 5935604196722, which contains 22 as substring.

It is a Chen prime.

It is equal to p₁₂₉₇₁₃ and since 1722731 and 129713 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 1722697 and 1722706.

It is not a weakly prime, because it can be changed into another prime (1722737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861365 + 861366.

It is an arithmetic number, because the mean of its divisors is an integer number (861366).

2^1722731 is an apocalyptic number.

1722731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722731 is an equidigital number, since it uses as much as digits as its factorization.

1722731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588, while the sum is 23.

The square root of 1722731 is about 1312.5284758816. The cubic root of 1722731 is about 119.8779082295.

The spelling of 1722731 in words is "one million, seven hundred twenty-two thousand, seven hundred thirty-one".