1722551 has 2 divisors, whose sum is σ = 1722552. Its totient is φ = 1722550.

The previous prime is 1722529. The next prime is 1722557. The reversal of 1722551 is 1552271.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1722551 - 2¹⁴ = 1706167 is a prime.

It is a super-3 number, since 3×1722551³ = 15333366693066150453, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1722557) 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, 861275 + 861276.

It is an arithmetic number, because the mean of its divisors is an integer number (861276).

2^1722551 is an apocalyptic number.

1722551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722551 is an equidigital number, since it uses as much as digits as its factorization.

1722551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 700, while the sum is 23.

The square root of 1722551 is about 1312.4599041495. The cubic root of 1722551 is about 119.8737329259.

It can be divided in two parts, 17225 and 51, that multiplied together give a triangular number (878475 = T₁₃₂₅).

The spelling of 1722551 in words is "one million, seven hundred twenty-two thousand, five hundred fifty-one".