610021 has 4 divisors (see below), whose sum is σ = 612544. Its totient is φ = 607500.

The previous prime is 609997. The next prime is 610031. The reversal of 610021 is 120016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a 4-Lehmer number, since φ(610021) divides (610021-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 610021 - 2⁵ = 609989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (610031) 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 in 3 ways as a sum of consecutive naturals, for example, 855 + ... + 1396.

It is an arithmetic number, because the mean of its divisors is an integer number (153136).

2⁶¹⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

610021 is a deficient number, since it is larger than the sum of its proper divisors (2523).

610021 is a wasteful number, since it uses less digits than its factorization.

610021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 610021 is about 781.0384113474. The cubic root of 610021 is about 84.8102340947.

Adding to 610021 its reverse (120016), we get a palindrome (730037).

The spelling of 610021 in words is "six hundred ten thousand, twenty-one".