612122561 has 4 divisors (see below), whose sum is σ = 628666452. Its totient is φ = 595578672.

The previous prime is 612122557. The next prime is 612122591. The reversal of 612122561 is 165221216.

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 592630336 + 19492225 = 24344^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 612122561 - 2² = 612122557 is a prime.

It is a super-3 number, since 3×612122561³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 612122561.

It is not an unprimeable number, because it can be changed into a prime (612122591) 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, 8271890 + ... + 8271963.

It is an arithmetic number, because the mean of its divisors is an integer number (157166613).

Almost surely, 2^612122561 is an apocalyptic number.

It is an amenable number.

612122561 is a deficient number, since it is larger than the sum of its proper divisors (16543891).

612122561 is a wasteful number, since it uses less digits than its factorization.

612122561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16543890.

The product of its digits is 1440, while the sum is 26.

The square root of 612122561 is about 24741.1107470946. The cubic root of 612122561 is about 849.0751467773.

Adding to 612122561 its reverse (165221216), we get a palindrome (777343777).

It can be divided in two parts, 6121 and 22561, that added together give a palindrome (28682).

The spelling of 612122561 in words is "six hundred twelve million, one hundred twenty-two thousand, five hundred sixty-one".