612207121 has 4 divisors (see below), whose sum is σ = 627139044. Its totient is φ = 597275200.

The previous prime is 612207119. The next prime is 612207133. The reversal of 612207121 is 121702216.

It is a happy number.

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 342065025 + 270142096 = 18495^2 + 16436^2 .

It is a cyclic number.

It is not a de Polignac number, because 612207121 - 2¹ = 612207119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 612207092 and 612207101.

It is not an unprimeable number, because it can be changed into a prime (612207181) 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, 7465900 + ... + 7465981.

It is an arithmetic number, because the mean of its divisors is an integer number (156784761).

Almost surely, 2^612207121 is an apocalyptic number.

It is an amenable number.

612207121 is a deficient number, since it is larger than the sum of its proper divisors (14931923).

612207121 is a wasteful number, since it uses less digits than its factorization.

612207121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14931922.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 612207121 is about 24742.8195846795. The cubic root of 612207121 is about 849.1142426997.

Adding to 612207121 its reverse (121702216), we get a palindrome (733909337).

It can be divided in two parts, 612207 and 121, that multiplied together give a palindrome (74077047).

The spelling of 612207121 in words is "six hundred twelve million, two hundred seven thousand, one hundred twenty-one".