611427681 has 6 divisors (see below), whose sum is σ = 883173330. Its totient is φ = 407618448.

The previous prime is 611427631. The next prime is 611427683. The reversal of 611427681 is 186724116.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 611078400 + 349281 = 24720^2 + 591^2 .

It is not a de Polignac number, because 611427681 - 2⁶ = 611427617 is a prime.

It is a super-2 number, since 2×611427681² = 747687618186075522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (611427683) 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 5 ways as a sum of consecutive naturals, for example, 33968196 + ... + 33968213.

It is an arithmetic number, because the mean of its divisors is an integer number (147195555).

Almost surely, 2^611427681 is an apocalyptic number.

It is an amenable number.

611427681 is a deficient number, since it is larger than the sum of its proper divisors (271745649).

611427681 is a wasteful number, since it uses less digits than its factorization.

611427681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67936415 (or 67936412 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 611427681 is about 24727.0637359149. The cubic root of 611427681 is about 848.7537357974.

The spelling of 611427681 in words is "six hundred eleven million, four hundred twenty-seven thousand, six hundred eighty-one".