612221671 has 4 divisors (see below), whose sum is σ = 625247712. Its totient is φ = 599195632.

The previous prime is 612221651. The next prime is 612221677. The reversal of 612221671 is 176122216.

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

It is a cyclic number.

It is not a de Polignac number, because 612221671 - 2²⁵ = 578667239 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 (612221677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6512950 + ... + 6513043.

It is an arithmetic number, because the mean of its divisors is an integer number (156311928).

Almost surely, 2^612221671 is an apocalyptic number.

612221671 is a deficient number, since it is larger than the sum of its proper divisors (13026041).

612221671 is a wasteful number, since it uses less digits than its factorization.

612221671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13026040.

The product of its digits is 2016, while the sum is 28.

The square root of 612221671 is about 24743.1136076283. The cubic root of 612221671 is about 849.1209694615.

Adding to 612221671 its reverse (176122216), we get a palindrome (788343887).

The spelling of 612221671 in words is "six hundred twelve million, two hundred twenty-one thousand, six hundred seventy-one".