612121 has 4 divisors (see below), whose sum is σ = 617652. Its totient is φ = 606592.

The previous prime is 612113. The next prime is 612133. The reversal of 612121 is 121216.

612121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26896 + 585225 = 164^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 612121 - 2³ = 612113 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2596 + ... + 2821.

It is an arithmetic number, because the mean of its divisors is an integer number (154413).

2⁶¹²¹²¹ is an apocalyptic number.

It is an amenable number.

612121 is a deficient number, since it is larger than the sum of its proper divisors (5531).

612121 is a wasteful number, since it uses less digits than its factorization.

612121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530.

The product of its digits is 24, while the sum is 13.

The square root of 612121 is about 782.3816204385. The cubic root of 612121 is about 84.9074425022.

Adding to 612121 its reverse (121216), we get a palindrome (733337).

The spelling of 612121 in words is "six hundred twelve thousand, one hundred twenty-one".