611257861 has 2 divisors, whose sum is σ = 611257862. Its totient is φ = 611257860.

The previous prime is 611257859. The next prime is 611257919. The reversal of 611257861 is 168752116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382945761 + 228312100 = 19569^2 + 15110^2 .

It is a cyclic number.

It is not a de Polignac number, because 611257861 - 2¹ = 611257859 is a prime.

Together with 611257859, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 611257861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611257841) 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 as a sum of consecutive naturals, namely, 305628930 + 305628931.

It is an arithmetic number, because the mean of its divisors is an integer number (305628931).

Almost surely, 2^611257861 is an apocalyptic number.

It is an amenable number.

611257861 is a deficient number, since it is larger than the sum of its proper divisors (1).

611257861 is an equidigital number, since it uses as much as digits as its factorization.

611257861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 611257861 is about 24723.6296081300. The cubic root of 611257861 is about 848.6751499399.

It can be divided in two parts, 61125 and 7861, that added together give a palindrome (68986).

The spelling of 611257861 in words is "six hundred eleven million, two hundred fifty-seven thousand, eight hundred sixty-one".