701821 has 4 divisors (see below), whose sum is σ = 704700. Its totient is φ = 698944.

The previous prime is 701819. The next prime is 701837. The reversal of 701821 is 128107.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128107 = 7 ⋅18301.

It can be written as a sum of positive squares in 2 ways, for example, as 168921 + 532900 = 411^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 701821 - 2¹ = 701819 is a prime.

It is a Duffinian number.

701821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (701881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1036 + ... + 1573.

It is an arithmetic number, because the mean of its divisors is an integer number (176175).

2⁷⁰¹⁸²¹ is an apocalyptic number.

It is an amenable number.

701821 is a deficient number, since it is larger than the sum of its proper divisors (2879).

701821 is a wasteful number, since it uses less digits than its factorization.

701821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2878.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 701821 is about 837.7475753471. The cubic root of 701821 is about 88.8673274671.

Adding to 701821 its reverse (128107), we get a palindrome (829928).

It can be divided in two parts, 70 and 1821, that added together give a triangular number (1891 = T₆₁).

The spelling of 701821 in words is "seven hundred one thousand, eight hundred twenty-one".