612871345321 has 3 divisors (see below), whose sum is σ = 612872128183. Its totient is φ = 612870562460.

The previous prime is 612871345301. The next prime is 612871345357. The reversal of 612871345321 is 123543178216.

It is a happy number.

The square root of 612871345321 is 782861.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 266680320921 + 346191024400 = 516411^2 + 588380^2 .

It is not a de Polignac number, because 612871345321 - 2¹⁹ = 612870821033 is a prime.

It is a super-2 number, since 2×612871345321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612871345301) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 391431 + ... + 1174291.

Almost surely, 2^612871345321 is an apocalyptic number.

612871345321 is the 782861-st square number.

612871345321 is the 391431-st centered octagonal number.

It is an amenable number.

612871345321 is a deficient number, since it is larger than the sum of its proper divisors (782862).

612871345321 is an frugal number, since it uses more digits than its factorization.

612871345321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565722 (or 782861 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The spelling of 612871345321 in words is "six hundred twelve billion, eight hundred seventy-one million, three hundred forty-five thousand, three hundred twenty-one".