612641281 has 8 divisors (see below), whose sum is σ = 705507264. Its totient is φ = 521111760.

The previous prime is 612641279. The next prime is 612641297. The reversal of 612641281 is 182146216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 612641281 - 2¹ = 612641279 is a prime.

It is a super-2 number, since 2×612641281² = 750658678370641922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (612641581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333130 + ... + 334963.

It is an arithmetic number, because the mean of its divisors is an integer number (88188408).

Almost surely, 2^612641281 is an apocalyptic number.

It is an amenable number.

612641281 is a deficient number, since it is larger than the sum of its proper divisors (92865983).

612641281 is a wasteful number, since it uses less digits than its factorization.

612641281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668231.

The product of its digits is 4608, while the sum is 31.

The square root of 612641281 is about 24751.5914841854. The cubic root of 612641281 is about 849.3149178828.

Adding to 612641281 its reverse (182146216), we get a palindrome (794787497).

The spelling of 612641281 in words is "six hundred twelve million, six hundred forty-one thousand, two hundred eighty-one".